All fascists are right-wing authoritarians, but not all right-wing authoritarians are fascists. Trump ticks all or almost all of Umberto Eco's 14 boxes defining "eternal fascism". Argentine sociologist Gino Germani, a refugee from Italian fascism who then lived under the Argentine imitation called Peronismo, called Latin American military regimes a functional substitute for fascism since they created no mass parties to build a truly fascist state. https://www.jstor.org/stable/23261732

On the other hand, Trump ticks lots of Nazi boxes: https://medium.com/discourse/nazi-trump-his-own-words-answer-in-confession-by-projection-9d643fc99e60