What is the wheelbase difference between the John Deere 8RX 340 Tractor and 7R 350?

The John Deere 8RX 340 Tractor has a wheelbase of 127.36 in. and the John Deere 7R 350 has a wheelbase of 115.2 in., a difference of 12.16 in. The John Deere 8RX 340 Tractor has the higher wheelbase.