What is the PTO horsepower difference between the John Deere 6M 115 and 6R 120?

The John Deere 6M 115 has a PTO horsepower of 88 hp and the John Deere 6R 120 has a PTO horsepower of 91 hp, a difference of 3 hp. The John Deere 6R 120 has the higher PTO horsepower.