[MrDrDr]

I found the following paper helpful in understanding the evolutionary pressures on a species (https://www.science.org/doi/10.1126/sciadv.abg5391). It's possible for two different genetic ancestries to arrive at the same phenotype independently where there environment is virtually identical. The example here, cichlid fish in lakes like Tanganyika and Victoria, evolved similar traits independently from different genetic lineages.

One could imagine (climate change not withstanding) that different geographic human populations would always tend to evolve to the same phenotype over time.