When the CFP ranked the teams, they ranked Texas #3 and Clemson #16. They got promoted to #12 because the ACC champion is guaranteed a spot. In reality, Texas starts off with the lowest ranked team in the tournament. Should Texas win that game, they progress to the 2nd lowest ranked team in the tourney (ASU ranked #12, promoted to #4 since the top 4 champs got byes).
Texas hasn't been a consistent enough performer on offense for me to make bold predictions. However, they'll play game 1 at home, game 2 in the stadium they just left, and game 3 at JerryWorld. Defense travels.
In contrast, had they won the SECCCG, they'd be waiting until January to play a game against the #5 or #8 seed in New Orleans.