I think there was a bunch of evidence already that also strongly indicated technology transfer throughout Eurasia in the last few millennia BCE, especially military technology.

For example, two-wheeled light military chariots probably originated in Central Asia with the Sintashta culture around 2000 BCE, and spread from there to everywhere from Egypt to East Asia.

In addition, though I dunno if you want to consider it a technology transfer, their particular horse breeds, bred to drive those chariots, also spread to the extent those breeds are the ancestors of every living domestic horse (https://www.nature.com/articles/s41586-021-04018-9)