They certainly saw themselves different from African/black people and Anti-black sentiment was high back then. It's a bit silly trying to apply today's standards of race when things were way different back then.
so what? we're seeing that even TODAY in africa, black folks don't see themselves as the same. the hutu and tutsis almost exterminated each other in a genocide. the northern and southern sudanese had to split their country in half because they didn't see each other as the same. in south africa we're seeing south africans killing other africans in brutally henious ways cause they don't see themselves as the same.
are the hutus and tutsis different races because they have strong racist sentiments to one another? are the northern sudanese and southern sudanese different races because they have strong racist feelings toward one another?
you can't have it both ways. very few africans would be considered black today if the measure of blackness is how africans view themselves vis-a-vis other africans.