TLDR: Foundings Zionists agreed with and worked with Nazis, seeing themselves as supporting the superiority of the Jewish race the same way the Nazis did so for the Aryan race.
Both movements used the same techniques:
- Palestine was Jewish lebensraum, and was stolen with the same techniques as the Nazis
- both touted fake 'socialism' (e.g. kibbutzes) while actively working with their preferred capitalists to further racial superiority
Zionists were rather indifferent to the Holocaust, and spent barely any resources on saving Jews from it. Zionists explicitly wrote that they wanted to save only those most useful to future Israel, and not all the other weathless Jewish rabble.
Only after the Holocaust ended did they start touting it to support Israel.