Are buffalo and bison the same?

Nope. Bison and Buffalo are very different.

The only 2 living examples of buffalo are the African Cape and the Asian Water buffalo.

The only 2 living Bison species are the North American Bison and the European Bison.

They have many differences and are not alike in anyway except that the belong to the Bovine family.

If you want to say a Buffalo is a Bison then you might as well say a sheep is a goat is cow is buffalo.