Simply put the name is generic and refers to 'versions' of all sorts of ECU software.
Think of it of software update for your car.
A practical example would be.
- You code your car which has v46.3 daten i.e. code xenon retrofit
- Vehicle for some reason goes to dealer and gets software update to v48.1
- You now need v48.1 to code your car
It also impacts upon programming aswell.