Why not just run the VIN through one of the VIN decoders and you can see what the interior leather is in both yours and the loaner. All you'll need is the last 7 digits of each car's VIN. Here's 3 of my favorite VIN decoding sites:
- https://www.mdecoder.com/
- https://bimmercat.com/bmw/en/vin/decoder/online
- https://decoder.bvzine.com/