In New Horizons, prior to the 2.0 update, Wilbur had no unique character model, he was simply reusing Orville's with sunglasses and a headset added in-game.
After the 2.0 update, Wilbur was given his own unique model, complete with slightly altered eye textures to differentiate him from Orville. As you can see his eyelids are brown instead of orange, and are more relaxed by default. This detail often goes overlooked, as Wilbur tends to always wear fully opaque sunglasses.
This change was likely made due to the addition of Amiibo, as one could remove his sunglasses and headset via Photopia, which would make him look practically identical to Orville.














