What is the difference between the John Deere 6M 250 and 6R 260?

Here is how the John Deere 6M 250 and John Deere 6R 260 compare on John Deere's published specifications:

• Horsepower: John Deere 6M 250 247 hp vs John Deere 6R 260 256 hp
• Pto horsepower: John Deere 6M 250 195 hp vs John Deere 6R 260 210 hp
• Weight: John Deere 6M 250 21164 lb. vs John Deere 6R 260 21716 lb.
• Fuel capacity: John Deere 6M 250 108.3 gal. vs John Deere 6R 260 107 gal.
• Wheelbase: John Deere 6M 250 114 in. vs John Deere 6R 260 114 in.