Biggest difference between Soviet style Marxism and Nazi-ism is that the commies wanted all nations to adopt Marxism. The Nazis wanted all nations to be ruled by Nazis, especially Germanic citizens in that country.
Bottom line: they advocated the state control (Nazis) or own (Marxists) the means of production.
the difference is simple.
Commies worship the state or the idea of the collective.
Fascists worship an individual and rally around that individual as supreme leader with distribution of wealth based on the direction of the leader.
Commies secure all capital and wealth under the collective and force all people to live under “equal” conditions. Everyone gets the same amount of pay for work, they can only own one state manufactured car and live under a state owned collective roof wearing state made clothes. You only have state run media.
Under fascism, there is a pretense that you can prosper but that prosperity is linked to the party and the leader. Loyalty provides comfort. You have state “controlled” media mainly providing propaganda for the leader.
What we have now is moving toward the fascist/socialist model. Don’t be bullied into believing you can’t equate the current leadership to the slide toward fascism, the similarities are too perilous to ignore.