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Hello! Is it possible to change the keyboard from Italian one to U.S. one for this specific machine?

There are a few different ways one can change things: The first and the cheapest is to get a keyboard skin which offers the key mapping you want. Here’s one source: Kuzy SkinsThe second is to swap out the keycaps as needed: TheBookYard - KeyCapsThe third and the most expensive way is to replace the keyboard completely: MacBook Pro 15" Retina (Late 2013-Mid 2014) Upper Case Assembly following this IFIXIT guide: MacBook Pro 15" Retina Display Late 2013 Upper Case Assembly Replacement