Im looking to remove the 2.0 AZJ engine from my 2003 golf and replace it with a V5 AQN. I know i could just buy one, but i want to replace the engine for something a little different, as i cant stretch to replacing the car. What i would like to know is, do the AZJ and AQN have the same ecu pinouts as each other, on the car side of the ecu loom, to allow it to be plug and play? Or would the car side loom be required also? With regards to the immobiliser, are all mk4s generation 2 allowing my existing to be coded to the new v5 ecu? Or if there is a difference in generations between my car and the ecu, can i fit the dash insert from an earlier car and code my key to that dash panel? Or would it just be easier to get the immobiliser removed from the ecu? I have looked and searched but cant seem to find the answers im looking for. Not being at work at the moment, means i have no access to ELSA. Many thanks in advance, any help is appreciated.