After a tough road win, the Steelers traveled home to take on the Vikings.  In the first quarter, the Steelers would score first as Ben Roethlisberger found Martavis Bryant on a 27-yard pass to make it 7-0 for the only score of the period.  They increased their lead in the second quarter when Roethlisberger found Juju Smith-Schuster on a 4-yard pass to make it 14-0.  The Vikes then got on the board later on in the quarter when Kai Forbath kicked a 42-yard field goal to make it 14-3 at halftime.  In the third quarter, the Steelers went back to work as Chris Boswell kicked a 46-yard field goal to make it 17-3.  The Vikes drew closer when C.J. Ham ran for a 1-yard touchdown (with a failed PAT) to make it 17-9.  The Steelers however pulled away later on in the quarter when Boswell kicked a 29-yard field goal to make it 20-9.  In the fourth quarter, it was all Steelers as they closed out the game with 2 more field goals:  from 37 and 43 yards out to make it 23-9 and the eventual final score 26-9. With the win, the Steelers improved to 2-0.  The team's regular season winning streak also increased to 9 straight. The 17-point margin of victory marked the largest by Pittsburgh over Minnesota in series history.
Question: How many more field goals did Chris Boswell make compared to Kai Forbath?
Answer: 3