diff --git a/experimental/CHANGELOG.md b/experimental/CHANGELOG.md
index 1bcefed6d3c..ea641d52542 100644
--- a/experimental/CHANGELOG.md
+++ b/experimental/CHANGELOG.md
@@ -6,6 +6,10 @@ All notable changes to experimental packages in this project will be documented
 
 ### :boom: Breaking Change
 
+* fix(exporter-metrics-otlp-grpc): programatic headers take precedence over environment variables [#2370](https://github.com/open-telemetry/opentelemetry-js/pull/4334) @Vunovati
+* fix(exporter-metrics-otlp-http): programatic headers take precedence over environment variables [#2370](https://github.com/open-telemetry/opentelemetry-js/pull/4334) @Vunovati
+* fix(exporter-metrics-otlp-proto): programatic headers take precedence over environment variables [#2370](https://github.com/open-telemetry/opentelemetry-js/pull/4334) @Vunovati
+
 ### :rocket: (Enhancement)
 
 * feat(sdk-logs): add droppedAttributesCount field to ReadableLogRecord
diff --git a/experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/src/OTLPMetricExporter.ts b/experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/src/OTLPMetricExporter.ts
index 0ada75d4375..b1b12272750 100644
--- a/experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/src/OTLPMetricExporter.ts
+++ b/experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/src/OTLPMetricExporter.ts
@@ -49,6 +49,7 @@ class OTLPMetricExporterProxy extends OTLPGRPCExporterNodeBase<
       ...baggageUtils.parseKeyPairsIntoRecord(
         getEnv().OTEL_EXPORTER_OTLP_METRICS_HEADERS
       ),
+      ...config?.headers,
     };
 
     this.metadata ||= new Metadata();
diff --git a/experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/test/OTLPMetricExporter.test.ts b/experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/test/OTLPMetricExporter.test.ts
index 1df8e0cc128..79a6125a095 100644
--- a/experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/test/OTLPMetricExporter.test.ts
+++ b/experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/test/OTLPMetricExporter.test.ts
@@ -322,6 +322,15 @@ describe('when configuring via environment', () => {
     envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
     envSource.OTEL_EXPORTER_OTLP_METRICS_ENDPOINT = '';
   });
+  it('should use override url defined in env with url defined in constructor', () => {
+    envSource.OTEL_EXPORTER_OTLP_ENDPOINT = 'http://foo.bar/v1/metrics';
+    const constructorDefinedEndpoint = 'http://constructor/v1/metrics';
+    const collectorExporter = new OTLPMetricExporter({
+      url: constructorDefinedEndpoint,
+    });
+    assert.strictEqual(collectorExporter._otlpExporter.url, 'constructor');
+    envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
+  });
   it('should use headers defined via env', () => {
     envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar';
     const collectorExporter = new OTLPMetricExporter();
@@ -363,6 +372,23 @@ describe('when configuring via environment', () => {
     envSource.OTEL_EXPORTER_OTLP_METRICS_HEADERS = '';
     envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
   });
+  it('should override headers defined via env with headers defined in constructor', () => {
+    envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar,bar=foo';
+    const collectorExporter = new OTLPMetricExporter({
+      headers: {
+        foo: 'constructor',
+      },
+    });
+    assert.deepStrictEqual(
+      collectorExporter._otlpExporter.metadata?.get('foo'),
+      ['constructor']
+    );
+    assert.deepStrictEqual(
+      collectorExporter._otlpExporter.metadata?.get('bar'),
+      ['foo']
+    );
+    envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
+  });
 });
 
 testOTLPMetricExporter({ useTLS: true });
diff --git a/experimental/packages/opentelemetry-exporter-metrics-otlp-http/src/platform/node/OTLPMetricExporter.ts b/experimental/packages/opentelemetry-exporter-metrics-otlp-http/src/platform/node/OTLPMetricExporter.ts
index d051b7be9b3..cd648ce8753 100644
--- a/experimental/packages/opentelemetry-exporter-metrics-otlp-http/src/platform/node/OTLPMetricExporter.ts
+++ b/experimental/packages/opentelemetry-exporter-metrics-otlp-http/src/platform/node/OTLPMetricExporter.ts
@@ -48,6 +48,7 @@ class OTLPExporterNodeProxy extends OTLPExporterNodeBase<
       ...baggageUtils.parseKeyPairsIntoRecord(
         getEnv().OTEL_EXPORTER_OTLP_METRICS_HEADERS
       ),
+      ...config?.headers,
     };
   }
 
diff --git a/experimental/packages/opentelemetry-exporter-metrics-otlp-http/test/node/CollectorMetricExporter.test.ts b/experimental/packages/opentelemetry-exporter-metrics-otlp-http/test/node/CollectorMetricExporter.test.ts
index 2f809e62517..66f6af3006e 100644
--- a/experimental/packages/opentelemetry-exporter-metrics-otlp-http/test/node/CollectorMetricExporter.test.ts
+++ b/experimental/packages/opentelemetry-exporter-metrics-otlp-http/test/node/CollectorMetricExporter.test.ts
@@ -296,6 +296,18 @@ describe('OTLPMetricExporter - node with json over http', () => {
       );
       envSource.OTEL_EXPORTER_OTLP_METRICS_ENDPOINT = '';
     });
+    it('should use override url defined in env with url defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_ENDPOINT = 'http://foo.bar/v1/metrics';
+      const constructorDefinedEndpoint = 'http://constructor/v1/metrics';
+      const collectorExporter = new OTLPMetricExporter({
+        url: constructorDefinedEndpoint,
+      });
+      assert.strictEqual(
+        collectorExporter._otlpExporter.url,
+        constructorDefinedEndpoint
+      );
+      envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
+    });
     it('should use headers defined via env', () => {
       envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar';
       const collectorExporter = new OTLPMetricExporter();
@@ -318,6 +330,20 @@ describe('OTLPMetricExporter - node with json over http', () => {
       envSource.OTEL_EXPORTER_OTLP_METRICS_HEADERS = '';
       envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
     });
+    it('should override headers defined via env with headers defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar,bar=foo';
+      const collectorExporter = new OTLPMetricExporter({
+        headers: {
+          foo: 'constructor',
+        },
+      });
+      assert.strictEqual(
+        collectorExporter._otlpExporter.headers.foo,
+        'constructor'
+      );
+      assert.strictEqual(collectorExporter._otlpExporter.headers.bar, 'foo');
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
+    });
     it('should use delta temporality defined via env', () => {
       for (const envValue of ['delta', 'DELTA', 'DeLTa', 'delta     ']) {
         envSource.OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE = envValue;
diff --git a/experimental/packages/opentelemetry-exporter-metrics-otlp-proto/src/OTLPMetricExporter.ts b/experimental/packages/opentelemetry-exporter-metrics-otlp-proto/src/OTLPMetricExporter.ts
index 8d1fb114b3f..52c9991e30a 100644
--- a/experimental/packages/opentelemetry-exporter-metrics-otlp-proto/src/OTLPMetricExporter.ts
+++ b/experimental/packages/opentelemetry-exporter-metrics-otlp-proto/src/OTLPMetricExporter.ts
@@ -51,6 +51,7 @@ class OTLPMetricExporterNodeProxy extends OTLPProtoExporterNodeBase<
       ...baggageUtils.parseKeyPairsIntoRecord(
         getEnv().OTEL_EXPORTER_OTLP_METRICS_HEADERS
       ),
+      ...config?.headers,
     };
   }
 
diff --git a/experimental/packages/opentelemetry-exporter-metrics-otlp-proto/test/OTLPMetricExporter.test.ts b/experimental/packages/opentelemetry-exporter-metrics-otlp-proto/test/OTLPMetricExporter.test.ts
index 80902daeaa2..51c175f8e6c 100644
--- a/experimental/packages/opentelemetry-exporter-metrics-otlp-proto/test/OTLPMetricExporter.test.ts
+++ b/experimental/packages/opentelemetry-exporter-metrics-otlp-proto/test/OTLPMetricExporter.test.ts
@@ -148,6 +148,18 @@ describe('OTLPMetricExporter - node with proto over http', () => {
       );
       envSource.OTEL_EXPORTER_OTLP_METRICS_ENDPOINT = '';
     });
+    it('should use override url defined in env with url defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_ENDPOINT = 'http://foo.bar/v1/metrics';
+      const constructorDefinedEndpoint = 'http://constructor/v1/metrics';
+      const collectorExporter = new OTLPMetricExporter({
+        url: constructorDefinedEndpoint,
+      });
+      assert.strictEqual(
+        collectorExporter._otlpExporter.url,
+        constructorDefinedEndpoint
+      );
+      envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
+    });
     it('should use headers defined via env', () => {
       envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar';
       const collectorExporter = new OTLPMetricExporter();
@@ -163,6 +175,20 @@ describe('OTLPMetricExporter - node with proto over http', () => {
       envSource.OTEL_EXPORTER_OTLP_METRICS_HEADERS = '';
       envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
     });
+    it('should override headers defined via env with headers defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar,bar=foo';
+      const collectorExporter = new OTLPMetricExporter({
+        headers: {
+          foo: 'constructor',
+        },
+      });
+      assert.strictEqual(
+        collectorExporter._otlpExporter.headers.foo,
+        'constructor'
+      );
+      assert.strictEqual(collectorExporter._otlpExporter.headers.bar, 'foo');
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
+    });
   });
 
   describe('export', () => {