Sync Expressions

I have a mouth that has been lip-synced to a track. I have the jaw as a separate set of drawings that correspond to the mouth positions. Is there a way to write an expression that will automatically sync the jaw drawings to the corresponding mouth positions so that I don’t have to do that manually?

So for example when Mouth A is exposed, Jaw A is exposed etc.

if not with expressions is this doable via scripting?