What is the difference between the John Deere 6R 180 and 6R 185?

Here is how the John Deere 6R 180 and John Deere 6R 185 compare on John Deere's published specifications:

• Horsepower: John Deere 6R 180 178 hp vs John Deere 6R 185 182 hp
• Pto horsepower: John Deere 6R 180 177 hp vs John Deere 6R 185 147 hp
• Weight: John Deere 6R 180 19621 lb. vs John Deere 6R 185 17990 lb.
• Fuel capacity: John Deere 6R 180 95.1 gal. vs John Deere 6R 185 74 gal.
• Wheelbase: John Deere 6R 180 110.2 in. vs John Deere 6R 185 108.8 in.