Frontier said that the variation would only apply to what actually exists in the species.
The fact of the matter is that most wild animals don't have much physical variation in color. A lion is always gonna be yellow, a zebra is always gonna be white, an elephant is always gonna be grey. Some animals will naturally have more variation than others and some will be nearly indistinguishable. That's how it works in real life as well. If you look at a herd of elephants you won't know an individual based off their color, but by the size and shape of their tusks, and wounds on the head, ears, or body. (Differences in tusks and horns is its own thing to tackle at another time)
The real variation is gonna have to exist in the markings for many species. Frontier NEEDS to work on more marking variations for all the species that have them: Hyenas, wild dogs, tigers, jaguars, etc. need more markings for the game to mix and match.