This story gets more interesting by the moment -- just got this message from the body shop (Criswell in Annapolis, MD) doing the structural repairs:
We received the undamaged rear body panel in today! When we received it in today, we noticed it looked like the one we received the other day. Not even 20 minutes after receiving it, we got a call from the Regional Body Shop Manager for Tesla. He informed us that they now only make the one style, and that we would have to make adjustments to make the rear body panel trim fit. There is no bulletin of any kind to support this or give us guidance on retrofitting. Tesla parts did not inform us when we brought this issue up.
Our tech is fully aware and is actively working on the car. I have contacted SDR to revise the scope of the work they want us to do. We will be putting the panel on, and caulking the vehicle. We will also spray bomb with a green e-coat but will not be cutting it in fully. This will get your car to SDR faster. They will take care of the painting and adding of sound deadeners (will be supplied in the car.) There are wait times with the glues and caulk. My tech feels comfortable with releasing the car late Monday or Tuesday afternoon. Depends on how far he can get and drying times.
I have updated the Body Shop team at Tesla letting them know SDR is retrofitting the trim panel and should have your car by Tuesday night.
SDR is the local shop that will paint the repaired sections do all of the other cosmetic and other work necessary for me to get my car back.
So it appears that what several posters have suggested (changes in the body part details) was my problem from the get go. But Tesla failed to communicate that to Criswell.