I have wondered a few times if you traveled back in time, say 5000 years for the sake of this discussion, and you brought a young child back to the 21st Century and enrolled him in school and then provided him with a college education, would he grasp technology on the average level of a college grad? Basically, I'm wondering if his brain would be as well developed as person of today. How well would he compete in sports?
Three hundred years ago, Europeans were introduced to Native Americans who were still living in the Stone Age. That's a pretty big gulf that makes 5000 years ago seem like nothing. 60 years ago, I went to college in Montana where Native Americans were also attending. Granted, not a lot of them, but the ones who were there were doing just fine.
Of course both cultures had been evolving in only slightly different ways since the stone age, so the only difference that would probably stand out would be the difference in the size of their scientific knowledge base, at least as it would have been 300 years ago. I doubt that man has changed much in 5000 years. Evolution doesn't happen that fast, and humans haven't been around very long compared to the prehistoric heavy hitters like dinosaurs and turtles, who spanned an existence lasting thousands of times longer than us.
This is an interesting topic to speculate on.