What is the difference between the John Deere 6R 110 and 6M 115?

Here is how the John Deere 6R 110 and John Deere 6M 115 compare on John Deere's published specifications:

• Horsepower: John Deere 6R 110 108 hp vs John Deere 6M 115 114 hp
• Pto horsepower: John Deere 6R 110 83 hp vs John Deere 6M 115 88 hp
• Weight: John Deere 6R 110 14330 lb. vs John Deere 6M 115 13779 lb.
• Fuel capacity: John Deere 6R 110 52.6 gal. vs John Deere 6M 115 46.2 gal.
• Wheelbase: John Deere 6R 110 102 in. vs John Deere 6M 115 94.5 in.