Jinx, Demolitionist

Q: What about a different card with the same Champion tag? If Jinx, Rebel is my Chosen Champion, can I get back a Jinx, Demolitionist, because Jinx is my Chosen Champion?

No. You can only get back a card with the exact full card name of the one you chose at the start of the game.

103.2.a.2. Must be a champion unit with a champion tag that matches the tag on your Champion Legend. Example: Loose Cannon has the tag Jinx . Therefore, a player could choose Jinx, Rebel or Jinx, Demolitionist as their Chosen Champion, because they also have the tag Jinx . Example: Tibbers has the tag Annie , but it is a signature unit, not a champion unit. It cannot be your Chosen Champion, even if your Champion Legend has the tag Annie .