Mustard,
White Nationalism puts a hyper focus on the inferiority of those who are not white. They emphasize the need for a white ethno-state because of said inferiority. There is this weird obsession with "white genocide' in the mind of the white nationalist. Oh and they love to talk about how much jews ruin everything lol. I can provide more details if needed
Black Nationalism puts a focus on returning to the mother land (Africa) in order to escape white supremacy. Their main goal is not "revenge" on white folks. That's an age old myth used to justify harsh repression of them