Isn’t there already a discussion about this exact same topic somewhere on this forum?
As far as I can tell from a small sample size, yes the TH-X00 cups are all uniform in shape and thickness (though my EBs had a small knothole in the one interior… bleh, nervosa) and any audible and measurable differences are attributable to the woods used and the mechanical properties inherent to them. As said above, this is the same logic behind different tonewoods used in instruments— I don’t play, but listen to enough live that there’s distinct differences.