If the situation were flipped, and Hitler was rising to power ~80 years after we had a massive war to take out MAGA fascists, then yeah I think people would refer to them as "MAGA", at least at first.

Nazi means refers to National Socialist, but at this point in history, it can also just refer to political movements that are fascist and Nazi-like. The meanings of words shift over time.

Edit: Fixed to appease a pedant.

I don't live in America, and many people here actually do use MAGA or Trumpism to describe the local right wing people and parties because they are largely just copying America...

imagine if the scenario was flipped and you called german fascists MAGAs.

It's semantics. The German and American fascists all pull from the same ideological and rhetorical playbook.

Veneration of the national security state. Zealous religious orthodoxy. Obsession with loyalty oaths and ethnicity sorting. Reflexive xenophobia. Institutionalized quackery.

It's all the same shit. Same as Apartheid Africa. Same as Kuomanting China. Same as Pinochet's Chile and Milei's Argentina.

What do you call people who wear red and black swastikas and say heil Hitler while doing a salute typical of the Nazi party?

Nazi is short for Nationalsozialist though. The party wasn't called Nazi, the members were.

Imagine gatekeeping nazis.