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I suspect the difference is the wires for the hand controls by the steering wheel and for the head up display in the dash.As far as I know there isn't an adapter that can be purchased and the two units aren't interchangeable to work with both types of connectors.
The unit will still work via the ISO wiring for the speakers and positive/earths feeds,but you won't be able to enter the code as you need the display and the hand controls to do it.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo