Each tournament will have its own playing conditions.
I'm not sure about other tournaments, as per the playing conditions of IPL
The super over will be declared as a tie.
Then, if the match is a league match.
1 point will be given per team
If both the teams have an equal number of points their relative
positions shall be determined by the following:
a: the team with the most wins in matches in the League during the
season will be placed in the higher position
b: if there are teams with equal points and equal wins during the
season, then in such case the team with the higher net run rate will
be placed in the higher position
c: if following the net run rate calculation above there are teams
which are still equal, then the team with the higher number of wickets
taken per balls bowled in the matches played that season in which
results were achieved will be placed in the higher position
d: if still equal at the end of the regular season then the team
position will be determined by drawing lots.
If the match is a play off match (Final, the Eliminator, Qualifier 1 or Qualifier 2 matches).
The team which, at the end of the relevant regular Season, finished in
the higher position in the League table will be deemed the winner of
the relevant play-off match.
Law 21 - IPL Playing conditions.