They will not be exact mirrors as the Safe areas they can scan are slightly different.
However you are correct and that is what I have done , Each head has it own zones. However there is no way to assign a whole set of cues to play to multiple zones without editing every cue separately. This takes hours to set up a whole workspace. I know I just had to do it.
They really need a way to do this in bulk or some other way to handle it in my opinion.