It is H2H in regards to Wild Card teams for a tie break with two teams:
TO BREAK A TIE FOR THE WILD-CARD TEAM
If it is necessary to break ties to determine the two Wild-Card clubs from each conference, the following steps will be taken.
If the tied clubs are from the same division, apply division tie breaker.
If the tied clubs are from different divisions, apply the following steps.
Head-to-head, if applicable.
Best won-lost-tied percentage in games played within the conference.
Best won-lost-tied percentage in common games, minimum of four.
Strength of victory.
Strength of schedule.
Best combined ranking among conference teams in points scored and points allowed.
Best combined ranking among all teams in points scored and points allowed.
Best net points in conference games.
Best net points in all games.
Best net touchdowns in all games.