Final Fantasy VI Expanded is a fan-made enhancement to the original Final Fantasy VI game. It likely includes additional content, such as new characters, areas, items, and quests, expanding on the original game's story and gameplay.  These expansions would be created by an independent team and are not officially produced by Square Enix.  The core of the game however is still rooted in the original Final Fantasy VI.

Final Fantasy VI Expanded

Final Fantasy VI (Japan)