Not all, but most. The Aryans had a cult of fire, for example, and according to the myths, it was they who brought it to Greece. The Iron Age coincides with the Aryan expansion. Music is first described in the samaveda. Observatories discovered in Andronovo. Aryans saddled horses, made chariots with spokes, they had competition. The art of the archer was characteristic of the eastern cavalry.
The Mediterranean and the Middle East were also quite developed before that. They used decent quality riveted bronze daggers and so on.
But Europe was in the Neolithic at that time.