88-98 3500 front clip question

[7beast]

Hey fellas i know it's a bit of a silly question but on some of the 88-98 3500 trucks back in the day some of them like tow trucks car haulers and such had a bit of a different looking front clip with a breather panel between the grille and the bumper. My question is in order for this to happen was the bumper moved down a bit or was the grille shortened a bit? I'm a bit confused.. here's a picture of both front clips...