Originally Posted by
tdilf
Does one of the rear wheels have a spacer installed before the cassette and the other rear wheel does not have the spacer?
I would almost expect more variance between the cassette placement then I would the disc rotors. Different brands use different freehub designs with only the spline being the commonality, since the der has a lot of adjustability I can see companies playing with this spacing to optimize their freehub design.
OP, a lot of branded hubs are just basic formulas with different labels slapped on them. An 09 C-dale mtb, a 14 Raleigh kid's cross bike, 17 diamondback kid's bike and 19 c-dale cross bike all featured the same exact same disc hub, no label but the same in every dimension and all overweight. Plenty of entry level aftermarket wheels will feature the same hub.