ecu compatibility

Hi everyone, I hope that you'll be able to shine a bit of light for me on a subject please.i have an old cmax and was wondering about the ecu compatibility.i have a problem with communication between modules' or even some of them not functioning well. I was looking everywhere for a ecu set (ecu,pcm,clocks,key,transponder and fuse board) with the same code but can't find it 😞. So I was wondering if I did replace all these parts with ones from another one the same year,model and engine size but diffrent ecu code would it work without the need to reprogram the units.its a great car and never gave us an once of problems.if anyone could tell me I would be grateful.thanks for reading.