Golf R uses the same ECU as ANY other 2.0 TFSI with MED9.1.
TT-RS and RS6 ECUs are also not 100% the same and not compatible, and they are MED9.1.2, not MED9.5.
Thanks for clearing that up.
Don't remember all the denominations, but TT-RS and RS6 both had a different MPC chip inside IIRC and some of the torque control was different. Some traces of MED17 were present too.
Been a bit now since I had either of those on the table.