Ah ok makes sense. For Sul Africa, I imagine not just a weird amalgam of OTL Angola/Mozambique and Dutch Cape but also Brazil. The former two were not successfully Europeanised for the most part while Brazil has a white plurality in population and is Lusophone all the way while Angola and Mozambique are far less Lusophone and white.
I imagine Sul Africa will thus be 'Brazil' ITTL as the primary Portuguese colony the way Brazil was OTL and receive thousands of Portuguese immigrants making it a Lusophone white plurality (if not majority) colony with a lot of European ancestry and cultural heritage and mixed race. As in it will be more Brazil in terms of culture and demographics by modern day ITTL than either Angola, Mozambique, or South Africa are with majority black populations and cultures for all that they speak European languages.
This is what I imagine Sul Africa can look like in the short term (as in by the year 1800) while if Spain manages to keep it/ alternatively Sul Africa once independent expands during the Scramble of Africa, it could become this