The Peloran who made Contact with humanity were nearly indistinguishable from Earthborn humans. But they were only a small minority of the total Peloran population, picked for that mission because of their appearance. The majority of the Peloran race look a bit more alien, or sometimes a lot more alien. They’re still undeniably human, though they look more like some of the traditional cheap aliens of Pre-Contact science fiction stories. Back when makeup artists painted up the actors in different colors and maybe added some minor facial prosthetics to give them an alien appearance. Little did those artists know just how close to the truth they really were.