https://collegefootballplayoff.com/sport...e-protocol
"...9. PAIRINGS FOR SEMIFINALS
The team ranked No. 1 by the selection committee will play team No. 4 in the semifinals. Team No. 2 will meet team No. 3.
When assigning teams to sites, the committee will place the top two seeds at the most advantageous sites, weighing criteria such as convenience of travel for its fans, home‐crowd advantage or disadvantage and general familiarity with the host city and its stadium. Preference will go to the No. 1 seed....
All displaced conference champions and the highest‐ranked champion from a non‐contract conference, as ranked by the committee, will participate in selected other bowl games and will be assigned to those games by the committee. If berths in the selected other bowl games remain available after those teams have been identified, the highest‐ranked other teams, as ranked by the committee, will fill those berths in rank order.
(Note: A “displaced conference champion” is a champion of a contract conference that does not qualify for the playoff in a year when its contract bowl hosts a semifinal game.)
The committee shall create the best matchups in these bowl games in light of the following considerations. None of these considerations shall affect the ranking of teams. Also, none of these considerations will be controlling in determining the assignment of teams to available bowl games.
The committee will use geography as a consideration in the pairing of teams and assigning them to available bowl games.
The committee will attempt to avoid regular‐season rematches when assigning teams to bowls.
To benefit fans and student‐athletes, the committee will attempt to avoid assigning a team, or conference, or the highest‐ranked champion of a non‐contract conference, to the same bowl game repeatedly.
The committee will consider regular‐season head‐to‐head results when assigning teams to bowls.
The committee will consider conference championships when assigning teams to bowls...."
So they only talk about 1-4 and 2-3 in the semi-finals but specifically mention avoiding rematches for the "otther bowls."
Seems like a clear intent to ignore it when assigning teams to semi-finals.