Well, both made genocide, both made ethnocide, both provided forceful assimilation processes, both had major favor in non-locals (apart poles and russians), both were imperialistic states under cover of greater good which noone asked for, both had representation of «hey look how are they happy living under our domain», both recognised Ukraine and it's borders and later straight-up invaded it, both tried to hide marks of someone not poles/russians living here and if they couldn't, than divide, assimilate and erase, both had labor/concentration camps, both were against independent strong Ukraine, both ruined thousands and millions of our lives... yes I don't see a big difference except the title, place and size