The higher GVWR truck has less capability per tire, because there are more tires to carry the weight.
4x2500 is more than 2x3500.
By the way, the point of DRW was WEIGHT CARRYING CAPACITY ONLY. It was never, and will never, be for "safety in case of a blowout." The problem with that theory is that when one tire in a dual set blows out, the other suddenly becomes grossly overloaded, and likely got damaged from the shrapnel of the blown tire.
Just a funny aside, but when I was a kid riding the school bus, one of the other kids described a fanciful tale of what would happen if a tire blew. The one tire would blow, immediately taking out the other tire, causing the rear axle to hit the ground and tear off. Now with the bus nose-high, the engine would tear free from its mounts and slide back along the frame rails wiping everyone out in the bus. So far none of you have managed to match that level of devastation.