What is the difference between the John Deere 9R 440 and 9R 490?

Here is how the John Deere 9R 440 and John Deere 9R 490 compare on John Deere's published specifications:

• Horsepower: John Deere 9R 440 434 hp vs John Deere 9R 490 483 hp
• Weight: John Deere 9R 440 40660 lb. vs John Deere 9R 490 45122 lb.
• Fuel capacity: John Deere 9R 440 400 gal. vs John Deere 9R 490 400 gal.
• Wheelbase: John Deere 9R 440 154 in. vs John Deere 9R 490 154 in.