Your comparison is very, very far from the truth. Just to give you a sense of the magnitude of your mistake, I'll try to explain.
Donkeys and horses hardly have any fertile offspring and when they do it's huge news. There is nothing close to that in humans today. If you want to compare that to humans you might compare it to sapiens-neanderthal admixture. There are signs the offspring were fertile only if the female parent was neanderthal, so even the sapiens-neanderthal genetic compatibility was greater than that between donkeys and horses.
Now, keeping that in mind, check the two images here:
http://dienekes.blogspot.com/2012/03/neandertaldenisovan-admixture-using-pca.html to compare the distance between different sapiens groups and neanderthals and denisovans. As you can see, all sapiens groups are so close to each-other that they just look like one single dot in the first picture, while Neanderthals and Denisovans, still not as incompatible with us as donkeys are with horses, are at the very edges. Only in the second picture you can see some variation, but even that is quite gradual.
This is not to say that there aren't different human groups with relatively consistent easily recognizable traits, but human diversity is far, far lower than diversity in most other animals, let alone among different species of animals.