Tire wear is caused by the surface of the tire being rubbed off through contact with the road. Most tire replacements happen because too much rubber has worn off of the contact surface.
While that happens some in the other direction, that’s not what usually causes road failure. You can tell this because pot-holes and other road failures have abrupt edges - they are not the road material until nothing is left but the earth beneath.
Roads also wear by being elastically deformed by the weight of the vehicles upon them. Eventually this deformation leads to failure of the road material, and it breaks away from the rest of the road, creating cracks and pot holes and so on.
Because the cause of failure is different, I don’t have any reason to expect the effect of vehicle weight to be the same. Moreover, unlike tire wear, its easy to hypothesize a physical reason that heavier vehicles will disproportionately wear the road: heavier vehicles will cause more deflection, and every material I have experience with will fail from repeated deflection faster if it’s deflected more.
