the thing here is going to be the computers. the two cars need to be equipped EXACTLY the same. for example: if the donor car had bluetooth, and the FWD car didn't, this could cause the computer to get "confused" when it went to look for the Bluetooth module in the car and didn't find it. that's why I said you would have to replace literally EVERY component in the car with pieces from the old one. this means down to the gauge cluster and radio (which are VIN protected now a days) in order for this to even become feasible. and that's assuming that the wiring between the two cars is the same, which it may not be. have two cars from two different model years? the swap just became impossibly more difficult.