I am sure there exists more than one difference between the the regimes mentioned. In my mind, I think that the Party is probably different than the Nazis because of the mass extermination of people. Certainly, the Party and Big Brother are guilty of their share of liquidations. Yet, we don't get the feeling in Orwell's work that what they do is on the level of Hitler's camps. We don't see the death camp vision in the Party that is so intrinsic to the Nazis. For example, we don't see a Treblinka or an Auschwitz in such magnitude with the Party. We don't get the feeling that the systematic annihilation of a particular group of people is at the forefront of the Party. Perhaps, they already have done this to solidify their own power and now they neednt do so. Yet, I don't sense that the taking of life that was so much a part of Hitler's Nazis is as present in the novel.