Well, it's certainly more realistic, what with its fists, rather than claws (no primates have claws! That's part of what being a primate is all about!). And the HD are higher, and it's somewhat more flavorful. If we wanted to convert it, we could backwards convert abilities generally attributed to the sasquatch/yeti/bigfoot to it (since those scientists who are open about such things think that Gigantopithecus is a pretty good candidate), such as stench and a racial bonus to Hide.