What is the wheelbase difference between the John Deere 6R 165 and 6M 180?

The John Deere 6R 165 has a wheelbase of 108.8 in. and the John Deere 6M 180 has a wheelbase of 110.2 in., a difference of 1.4 in. The John Deere 6M 180 has the higher wheelbase.