What is the difference between the John Deere S130 and S140?

Here is how the John Deere S130 and John Deere S140 compare on John Deere's published specifications:

• Wheelbase: John Deere S130 48.9 in. vs John Deere S140 48.9 in.
• Cutting width: John Deere S130 42 in. vs John Deere S140 48 in.