295/65R20 is 1.02 in taller than 275/65R20 (+3.00%) and 0.79 in wider; at an indicated 60 mph you are doing 61.8 mph.
Both overall diameters at one scale, sharing a center. The detail beside them enlarges the one place they differ, and its dimension is the difference the table below states.
The difference, one row at a time
275/65R20 and 295/65R20, one measurement per row; the difference is 295/65R20 minus 275/65R20