Biologically? I think average penis size is about the only difference other than skin colour. Though that could be a myth.
Sociologically the differences are immense, but they can eventually be eliminated, or diminish to insignificance. But it will take effort and good will on the part of everyone.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."