Jinx, Rebel

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.

103.3.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.

103.3.a.3. A player's Chosen Champion is both the specific card chosen for this slot during Deck Building and also any Champion Unit with the same name as the specific card selected for this specific slot during the course of play. Example: A player chose Jinx, Rebel as their Chosen Champion. One copy of Jinx, Rebel starts the game in their Chosen Champion zone. Any additional copies of Jinx, Rebel in their Main Deck, their hand, their trash, or on the board also count as their Chosen Champion for any game rules and effects that care about Chosen Champion status during the game.