tie pilot helmet

I have a Jim Tripon (Jimmiroquai) fibreglass ANH chestbox for sale, with cast and acrylic greeblies ready to go. Some greeblies already painted. There's also a couple of upgraded pieces in machined aluminium from the Aluminium Falcon on FB. There's a hole in the back for access and potential...

They're all cast from original props (correct?), but each have subtle differences (I'm not referring to craftsmanship, etc., just visual accuracy). Some photos of the SDS helmets make the pilot look a little wider than RS and CFO. Whereas the RS helmets, the frown looks a little "toothy,"...