My Parts came but unfortunately the passenger side mirror assembly came with a crack in it. This is a total bummer since it's going to be warm this weekend. I guess I'll probably have to wait another week before attempting the swap.
Here are the door module part numbers:
Driver's Window Module (DDM): CP9Z-14B291-B
Passenger's Window Module (PDM): CP9Z-14291-E
I am beginning to believe that these are necessary for at least the puddle lamps, if not the puddle lamps and heated mirrors together. An old thread that mentions these parts seems to strengthen that conclusion.
Squeak, my guess is that as long as you have power rear windows; your mirrors can be heated with the turn signals just with the mirror swap. I don't think you could get the puddle lamp functionality without swapping out the all of your door hardware.