We aren't the same at all. In the last 10'000 years, we developed lactose tolerance, enabling us to herd cows for more than just meat. Only about 200 years ago, the first people with three arteries instead of two in their arms are showing up and recent studies seem to indicate that wisdom teeth are evolving away.

The evolution of a species never stops, even if it gets a bit slow. And our brains may have changed in the last 10'000 years too. Possibly even in the last 200.