Maybe it's just me, and I'm not trying to be argumentative, but I can see no appreciable differences in the skull Winkelman posted and mine. Mine does appear distorted in the photos, due to folds in the cap and the skull itself. Here is an unsewn skull of the type on the M43, looking as it should, without the distortion. It appears identical to the one on the cap.

skull alone (Medium).jpg (46.24 KB, 61 downloads)