This page is based on information from Jonathan Dushoff on the versions from Eswatini and Lesotho and Faizal Asmal on the South African version.
Alexey Lobashev reports that a similar game is played at Windhoek in Namibia where it is known in the local language (Oshiwambo) as Omulongo Womadi. This page describes versions of Casino played in Eswatini, Lesotho and South Africa. In these African games all cards (including picture cards if used) have a numerical capture value, so they can be thought of as versions of Royal Casino. Their characteristic feature is that captured cards are kept face up, and that a played card can capture not only cards from the central layout but also the top cards of opponents capture pile.
This page describes some variants of Casino that are played in southern Africa.