I'm sure somebody is going to post up Nanashi's site link. I do recall that the body types look the same, it's just the heads and avionics that differ between the models. I believe that when (if) you ever see a pic of a CF (brown valkyrie) with a VF-1S head, it's a VF-1B.
icic! *enlightened* thanks! remembered seeing hikaru operating VF-1J in CF colours but not a 1S though