Well just becuase the power output was the same on this motor doesn't mean there couldn't be a big difference on another motor. The Super Victor runners are a lot longer than the M1's runners so on some motors I'd expect to see a difference in the torque curve.

On a smaller displacement motor there might be a bigger difference since the torque peak would be at a higher speed and the motor might care more about the length of the runners. On a 505 motor the torque peak is at 4000 rpm so maybe the length difference isn't significant.