What is the difference between the John Deere S110 and S120?

Here is how the John Deere S110 and John Deere S120 compare on John Deere's published specifications:

• Wheelbase: John Deere S110 48.9 in. vs John Deere S120 48.9 in.
• Cutting width: John Deere S110 42 in. vs John Deere S120 42 in.