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^ Or if the gen/towniefied use the same files (often if it's in several variations by the same creator, occasionally if you find the same set as custom by one creator but edited as towniefied/geneticized by another creator - they'll usually say in the download info). Then you have to pick one or the other.
Two different sets by two different creators are usually compatible, regardless of whether they're geneticized/towniefied/custom, but they could be sorted in different ranges for the geneticized versions.