How does today's National Socialism movement differ from the National Socialism movement in 1920's Germany?

Very little. The far left in this country and the Nazis of mid-20th century Germany are virtually indistinguishable.

The primary difference between Trump's Fascist Movement and Germany's Fascist Movement in 1932 was Hitler was able to create his own Army that did not owe allegiance to Germany. The Brown Shirts swore allegiance to Hitler and through thuggery, murder and mayhem were able to intimidate anyone not supporting Hitler's Fascist Movement. Trump has demanded a sworn allegiance from his supporters, but has not been successful in creating a private army to intimidate the general population.

Trumps Nazi Party has taken over the Republican Party, like the Fascist in 1932, they assumed the name of an existing Political Party that was acceptable to the public because it sounded like it supported the public.

In Germany the Nazis wanted to exterminate the Jews, Slavs and socialists. Today the Nazis are about blacks and latinos, and still want to exterminate the socialists. Other differences are in wardrobe and imagery. The Germans wore brown shirts and flew a swastika; today's Nazis wear MAGA hats and fly the Stars and Bars.

National Socialism in Germany arose as a viable political alternative given the overt attempts of Communists to seize control of the struggling post-ToV Germany. The economic turn around under it was the single greatest in the history of humanity that's never been duplicated since.

The "National Socialist movement" today is non-existent and is a label used by the left to demonize anyone who ironically doesn't goose-step to their tyrannical ideology.

This time it's communist

Is there a national socialist movement today? I've not seen it. There's some Nazis here and there but they are the vast minority of people.