The difference is overall diameter. The 235/80/16 is 30.9 inches in diameter. The 235/85/16 is 31.7 inches in diameter.
A difference of 0.8 inches but only half of that, 0.4 inches, applies to above the tire. It is unlikely that 0.4 inches will cause a fit issue but you can check to make sure there is space enough above the existing tires for the larger size.
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*2016 CAF25SE Cruiser Aire 5er. *2020 Chevrolet 2500 HD Custom
*Ted & Tricia (Mimi - Teacup Poodle/ Sailor - Maltipoo)
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