I've done this conversion and the main differences are:
Front Bumper & associated grills
Rear bumper & Diffuser
Front Washer Jets
The wings and bonnet are the same despite what you may read. They were different on the 8P as the the facelift had the indicators in the wings, hence there was alot more work involved. I was unsure about the lights myself, but thanks to knowledgeable members on here they would work as long as i went for the same type, so i took the plunge and swapped bi-xenons to bi-xenons and the lights worked as expected. If you are going from xenons to led, they will not be plyg and play. However the auto leveling feature doesn't work, which I will get sorted at some point. Regarding the rear lights, there is a write up on how to do this conversion, but have only managed to get the 2 outer lights working, and get my head round why the inner ones will not work.