That's as maybe, but they HAVE printed different spines for the different countries in the past, but with the same fronts and backs.
For example, my French Justice League steelbook has the UltraHD blu-ray, 3D blu-ray and blu-ray logos on it. But the front and back are just the same as the UK release (which didn't contain the UltraHD disc, and therefore did not have the UltraHD blu-ray logo on the spine).