The difference is that Palestinians are merely reacting to violence that was imposed upon them and initiated by “Israel” when they were ethnically cleansed during the Nakba and subsequently militarily occupied and subjected to illegal confiscation of their remaining land and possessions…not to mention the abuses they have suffered personally under occupation during the last 75+ years.
For the Nazis, it was merely propaganda to persuade the public into complying with the economic and political goal of expulsion of Jews by the government. The only thing they had suffered at the hands of the Jews at that point was a call to boycott German goods by the World Jewish Conference.
Calling Jews (who have not actually done anything yet) “vermin” is not at all the same as observing zionist behavior after decades of killing and ceasing to believe that they are actually human. One is based upon theoretical future harm, the other is based upon observation of past behavior.