I don't think this is the 1st tie-breaker for Region II.

In 2006, Mauldin and Dorman both went 9-1 in the region, and Mauldin held a 2-1 head to head goals against advantage. BUT, Dorman won the region on a tie-breaker! At the end of the regular season in 2006, Dorman was 16-3, 9-1 in the region, 7-2 in non-region games. Mauldin was 20-3, 9-1 in the region, and 11-2 in non-region games at the end of the regular season.

Someone needs to check, but the 1st tie-breaker was NOT head to head goals against in 2006 and I doubt it has changed.