Celect ecm differences.

Greetings friends,
Does anyone actually know why there is 3 different part numbers for celect n14 ecms?
Not a plus, old school Celect.

3619037
3084473
3618046
Basically, I have a 1426 cpl Celect n14. 410hp. I have access to a 1896cpl that can do 500hp.
But have different ecm part numbers.
I realise all the cam timing and turbos etc injectors.

But im curious as to why the different numbers. Is the wiring of the vehicle end the same?
Any input at all would be good.