There's a difference, just like there is in Turk nationalist groups vs Turk supremacy groups (Grey Wolves). One believes they are genetically superior to all others and chosen to rule earth, and can excuse mass murder because they don't see anybody else as human. These groups are extremely dangerous and responsible for the holocaust and genocides in Africa. North Korean juche ideology is also supremist.
The other is a racist nationalist "pride" group that does not believe they are genetically superior like Weev, the Black Nationalist Panthers, ect. For the record I don't subscribe to either ideology but have met plenty of these groups unfortunately.