What is the PTO horsepower difference between the John Deere 7R 310 and 8R 310 Tractor?

The John Deere 7R 310 has a PTO horsepower of 260 hp and the John Deere 8R 310 Tractor has a PTO horsepower of 257 hp, a difference of 3 hp. The John Deere 7R 310 has the higher PTO horsepower.