What is the difference between how these trucks look?

[benbloom]

hey all, i am looking at these two trucks, one is a 66 gmc, and one is a 65 gmc. From what i know, all these gm 60-66 trucks should be exactly the same sheet metal (with minor changes, i know)
My question is, why do these trucks look so different? is it all the size of the wheels? i much prefer the way the white truck looks, but that is only a matter of stance, right? with smaller wheels the primered truck would look the same? The white one looks longer, is that an illusion? let me know what you guys think. thanks.
also, is it a deal breaker if one has rear coil springs? ive always wanted to drive one of these with rear coils, but does it really improve ride quality much?
thanks
Ben