well maybe you finde one on the workshop gl

I mean is there a mod that would change say a desert map to a nurgle corrupted map as nurgle corruption takes over the area, doing just like the snow corruption changing the battle maps to a snowy one.

what do you mean with "are there any" if you mean effect inside other corruptions that do the same then no

the changes to the battle map for the snow are made throu weather changes
in specific 1 file that dose basicly only that...adding snow to battlemaps

since mazisky helped me with that and i dont know anything about the other weather stuff i cant say yes or no

Since chaos undivided snow corruption changes the battle map, are there any that change it to other base corruptions like the monogods?

Massive work, thank you