Seems to be a blend of two things in this thread, regulators and motors. My experience is largely centered on B bodies, restoring a 69B&70B OE PW system, converting a 70B from manual to PW, and rebuilding PW switches.
Re the regulators, AFAIK very few if none of these will interchange between models, power or otherwise, due to the door/glass geometry variations. Regulators for the same year/model will typically be different part nos between convertible and hardtop.
Re motors, again - in my experience, I've used motors from C bodies as well as 81-85 junkyard Chryslers (which are still plentiful) on B bodies. IIRC in late 80s Chrysler redesigned the PW motors and they will not interchange with the older guys.