Replacing iveco 75e15 tector engines
 

Hi I'm looking for some info on swapping iveco engines I've got two iveco euro cargo 75e15 trucks one has a knackered engine the other one is good I'm looking at swapping them over.
I can do the engine swap no probs but what I need to find out is when I swap them over what do I do about the ecu situation will it work if I just use the engine ecu on the replacement engine or do I have to also transfer the other ecu over too and does it need recoding :o