Actually watching the replays of those plays confirms a point I always made to people who want to diminish the Pats win by saying the play call was to blame. You see it wasn't so much Butler breaking up the play that was remarkable. It was the fact he caught the ball. You can run that play 50 times in a row to same DB, and while he might break up the pass most of the time after a while, he's will make the pick once, twice at the most. I'm sure Seattle was prepared for the play to be incomplete, but never thought it would be picked.
Look at the play. Butler is in MUCH better position to make the pick against the Texans than he was vs the Seahawks. That's a particularly hard pick to make because you not only have go through the receiver, you are running speed directly toward the ball's path. That's the hardest ball to catch there is. Look at the contact Butler had to absorb when he hit the Seattle receiver. He literally knocked him on his ass backward. So he had to absorb that hit and still catch the ball. Truly remarkable and perhaps is now arguably the single greatest individual play in superbowl history.