The donor file we used was from an Audi A4 8K and we got it to work in Audi A5, Audi A6 C6, C7 and Q7 as far as I know.
Only minor settings change, so system parameters stay untouched as they can only be written by ZDC containers (VCP).
Stuff that will change is your favourite radio stations or nav settings.
Also the MMI 3GP and MMI 4G seem to have the same underlying structure.
I got valuable information here and I thought I would return the favor but any further discussion will be in my German "Home" forum.