We know the races on Athas aren’t the same as other settings. Trolls, for instance, are a lot like Goliaths, for instance.
I always planned on the ogres being doppelgängers, essentially. The high ogres from dragon lance (“irda”) are beautiful shapeshifters, and that’s what I was going to use as the “ogres” of athas in a green age setting.
As for the SSI games, you can get them on good old games for cheap. My credit union refuses to do business with them, however, so I’m out of luck (think GOG is based out of Malta, and my CU just literally won’t do business with any entities in Malta).