Way back when I was playing RQ2, so I've got passing familiarity with it ... to my mind RQ3 was an attempt to make the background a bit more fantasy-generic ... ah, yeah, here's the Wiki entry - RQ3 was licenced to Avalon Hill, but Chaosium kept copyright on Gloriantha:
https://en.wikipedia.org/wiki/RuneQuest
Basic Role Playing was a simplified version of Runequest (I've played both and wouldn't have thought them much different) and as I understand it Stormbringer/Elric and the ilk were setting specific versions of that.
I don't think RQ has the variation you see through iterations of something like D&D - but I'm happy to be corrected on that. :>