The ones you're referring to are the Yamnaya people from 5300 years ago (3300BC), they came from Ukraine and did the conquests, they most likely called themselves Aryans which is why Arya(n) is common meaning noble in all religions and languages they founded.

Civilisations that predate 3500BC may or may not have a continued lineage with these people, I think they probably did but there's only speculation really not conclusive evidence like there is of the Aryan conquests.