What is the difference between the John Deere S7 700 and T6 800?

Here is how the John Deere S7 700 and John Deere T6 800 compare on John Deere's published specifications:

• Horsepower: John Deere S7 700 402 hp vs John Deere T6 800 402 hp
• Fuel capacity: John Deere S7 700 250 gal. vs John Deere T6 800 211 gal.