without a difference. the edc-15 is also from 2.5 tdi 5-cylinder, but the firmware of 4 cylinders 1.9 tdi works in it
Dude, EDC15VM has no concept of cylinders.
All it does is control the plunger and the advance on the pump. It does not matter how many cylinders there are.
The hardware is different on a V8, the I/O is mapped differently. There are actual physical drivers for the injectors and ignition coils in a gasoline ECU with sequential injection.
Stop comparing things that can't be compared.
It's not going to work, end of story.