Yes. The starting point of the Boba helmet was the top of a baseball batting helmet, turned around back-to-front. I am curious how much was sculpted versus assembled. When I was using my RafalFett templates to gauge what was accurate versus not on the Black Series helmet, I didn't need to adjust scaling at all. The brow band fits perfectly, the visor is, for some reason, an even eighth-inch wider, vertically, shifting the cheekbones and cheeks down the same amount -- but then the bottom edges of those trimmed to make the overall height correct. The HBS visor is the same width as the original, but centered, where the original was offset to one side by about an eighth of an inch. Most curiously, the rear skirt, if the bottom edge had been even all the way around, is also accurate, but on the original, it looks like it got glued in to the brow band a little to high on the left side, which pulled it in on that side, and then the earcap adjusted to fit. The sort of that that likely wouldn't have happened with an actual sculpt.
Anyway, that batting helmet has a distinctly rounded shape, like a fat, stubby egg. Jango's was sculpted from scratch (possibly 3D modeled, I'd have to go back and check). Looking down at the top, it's almost perfectly elliptical, shaped to fit what hatmakers call a "long" skull shape. I have to get my hats blocked for that very reason. Many, as they come, dig into my forehead, but gap above the ears, unless they're stretched and formed to fit. I'm assuming that was deliberate on Lucasfilm's part, after Tem was cast. They definitely made the armor and helmet to fit him, rather than making it first and hoping whoever they found to stuff in it would fit. Jeremy Bulloch was 6'1" at the time ESB was filmed, and he still looks like a bobblehead in that bucket. I can see George wanting a helmet that better visually fit the person wearing it, especially as Jango had more of a role in AOTC than Boba did in ESB.