Board Thread:SMG4 Discussion/@comment-35367299-20181110172716/@comment-36596195-20181121001200

That one looks more like a Wii U Pro Controller to me due to its bulkiness.

The only real differences are the symbols on the buttons, in which A is replaced with a big black dot, B is replaced with a small black dot, X is replaced with a Hex Nut, and Y is replaced with a Biohazard symbol.