Yes. I think they are the same in common usage. Feral technically refers to animals that used to be domesticated and have become wild. I think wild technically refers to never having been domesticated.
That's what I would have presumed. But if a hose is born in the wild, never having been domesticated, is not that horse "wild"? I got suspicious because of the term "feral". It seems easier to support the culling of "feral" horses than "wild" horses. When careful terminology is created, it sounds political and my skepticism kicks in.