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To clarify the running question it seems of the cmt section, Shapeshifters are creatures that can change at will to other humans, animals, or fantastical forms. Skinwalkers, a Navajo mythology (shoutout to lovely fellow Navajo Native Peoples), is related to witchcraft and dark magic in which they can shape into animals to accomplish their bidding of spells and/or blood sacrifices.
The difference is in logical terms (literally). Skinwalkers, you could say, are a type of Shapeshifter, but not all Shapeshifters have to be or are Skinwalkers.