Fascists differed from communist because

were nationalists

Explanation:

The fascists and the communists seemed to have a lot in common, but they also had some differences. One of the most marking difference was that the fascists were nationalists, extreme ones, while the communists weren't. The fascists were trying to create ethnically pure nations in their territories, as well as in the territories that they have invaded. The communists were doing the opposite, they were trying to make people of ethnic groups equal in every aspect, thus eliminating the ethic aspect and the problems that come with it.