I'd think it's a strong "depends".. If you take 2 nearest neighbor bikes in a lineup (eg. Trek Checkpoint vs Domane?, Cervelo R3 vs Aspero?).. and use the same wheelset/tires on each, then I'd imagine the difference is very slight. Is the point of the question to evaluate how close can a gravel bike be relative to a road bike, on the road, by moving over the tires/wheels?