What does Node ConditioningCombine Do?

[Gasskin]

following the comfyui example,if i want to mix 2 controlnet (for example,if i want mix 2 canny controlnet

i will do like:

and the output result is close to what i imagined

but if i use the node ConditioningCombine like:

the result is strange,just like only use the condition_1

in short,ConditioningCombine's result is totally different from the way that connect 2 ControlNetApply together

maybe i am using it incorrectly,are these two ways the samething?

[comfyanonymous]

At every step it will "execute" both prompts and then average out the outputs. It's like AND on the a1111 ui if you are familiar with that.