Seems to me that the vehicle software will be specific to the engine, the transmission, and the rest of the vehicle. If you want to ignore the codes it throws, and not have all of the ancillary systems functioning as designed, you can probably do anything. But why would you?

__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue