What is the difference between the John Deere 6M 125 and 6R 130?

Here is how the John Deere 6M 125 and John Deere 6R 130 compare on John Deere's published specifications:

• Horsepower: John Deere 6M 125 123 hp vs John Deere 6R 130 128 hp
• Pto horsepower: John Deere 6M 125 97 hp vs John Deere 6R 130 101 hp
• Weight: John Deere 6M 125 13779 lb. vs John Deere 6R 130 14330 lb.
• Fuel capacity: John Deere 6M 125 46.2 gal. vs John Deere 6R 130 52.6 gal.
• Wheelbase: John Deere 6M 125 94.5 in. vs John Deere 6R 130 102 in.