I had a similar issue with another Congo Natty release - because he uses quite a few aliases (Blackstar, Conquering Lion, Lion Of Judah, Rebel MC, Tribe Of Issachar, X Project), and often has them down differently for the same tune on different releases. I think it's best to keep them as one, because although they're not the same artist according to the release, it could get confusing if a search for a tune returns multiple artists - all of whom are the same. If you see what I mean!