No quarterback has won the Super Bowl as a starter on two different teams.
Marv Fleming. Fleming was a tight end who won Super Bowls I and II with the Green Bay Packers and Super Bowls VII and VIII with the Miami Dolphins.
Ken Norton, Jr.
Ken Norton who was a member of the Dallas Cowboys that won Super Bowls XXVII and XXVIII and the San Francisco 49ers that won Super Bowl XXIX.
Matt Millen, who won with the Oakland/Los Angeles Raiders (Super Bowls XV and XVIII), the San Francisco 49ers (Super Bowl XXIV), and the Washington Redskins (Super Bowl XXVI).
The Cowboys and the 49ers each won 5 Super Bowls. The Steelers have won 6 Super Bowls.