What is the PTO horsepower difference between the John Deere 6MH 155 and 6M 165?

The John Deere 6MH 155 has a PTO horsepower of 120 hp and the John Deere 6M 165 has a PTO horsepower of 125 hp, a difference of 5 hp. The John Deere 6M 165 has the higher PTO horsepower.