It is not an ironclad guarantee but yes, in general, there will be some difference

Take an African, for example. His body has some advantages over mine, as in the muscle structure and the ability of that guy in using the muscle.

There is no need to wonder how the blacks can dance so gracefully. It comes natural to them. Like the Moonwalk from MJ, no matter how a white guy or a Japanese guy try, it just ain't the same.

But the African guy don't have ALL advantage over me. There are some advantages on my side. Maybe the ability to withstand cold (Africans are not made to tahan sejuk), for example.

So IQ wise, there ought to be a difference too.

But there is a caveat. Individual's IQ level differs. Even taking the highest IQ group in the world, the Armenians, there are some really stupid Armenians as well.

As a group, yes, there would be a difference.

If we start to mix up races, like for instance, the blacks in United States are not pure black, then it may be harder to measure the difference.

Take Barrack Obama.

If one is to measure his IQ, which group should his IQ be counted as?

The black --- from his African dad ?

The white --- from his White American mom ?