There's a lot of speculation but it's not proven. One of the big challenges when comparing these kind of claims is that the brain is plastic so it requires extra work to figure out what percentage of the identified difference is explained by differences in what activities people engage in. Since most big studies show more variation within a group than between groups, there's good reason to question whether this is measuring anything other than social effects.

The other challenge is figuring out what activities actually have a low-level differences translate into significant advantages. There are very few job where a single low-level difference is both significant and the only path to success — in most fields, there isn't a single model of top performer.