Comparisons don't have to assert equality, which is why people that say things like "Godwin's Law" are the worst. Either you can articulate the difference between an aspect of the Nazi regime and whatever you're arguing for, to move the conversation onto those differences, or you can't. Godwin is only useful when the conversation has run it's course and devolved into a flamewar.

You're already implicitly comparing the two when speak dismissively of the idea of "comparing" them. There are better ways of nipping a tangent in the bud.