[DRG]

There is common code but's SP3 was more like the weird uncle in the family with it's 200 m scale whereas SP1 and SP2 shared 50 m per hex which is why they were more popular than SP3 ever was ( it lasted two weeks on my computer ) and it had to be reverse engineered back to 50m to be useable in the format people prefered but their is all kinds of code that's set up to use the longer ranges so it must have been a treat sorting them out

The reason SP3 was used for WaW was it's "windows compatibility" at the time ( how did that work out in the long run ?) whereas SP2 was strictly DOS based back at the turn of the century but Andy did a full conversion of the code to windows in 2005 and here we are, still updating it 17 years after first starting work