Coloured in South Africa are a completely seperate culture of mainly mixed heritage and Africaans language and culture.
Chinese and Indian fit in and around.
Coloureds are culturally and ethnically different to Blacks even if some people want to incorrectly call them the same.
Just because they are darker than white does not put them in the same category. You need to check names for simple clues. eg Ntini = Black African, Prince = Coloured.