Hi James, no definate answer I'm afraid.
You need the pin codes from both ECUs to allow you to change the code in the replacement unit.

Go into pin extraction in the engine ECU (if listed) and try to read the code and then the same with the second unit.
If you cant read the pin out of the original unit(comms issue) then go into the DPI (dash) and read the pin from there.

If you can get both pins then you can do it yourself, if you cant then you need to send a log to have the pin code extracted for you.

Hth Sean