OK, Marco, here are some of my plants:
M. evermanniana grown from MG seed 640.9

M. evermanniana grown from DeH seed 528

M. evermanniana Lau 1272, and interesting a rather woolly form

And now for a couple of baxterianas:
First a plant named as pacifica, itself a form of baxteriana

and just a baxteriana

So there's a sample, of the plants - they are different, mostly evermanniana is whiter as I said before....but how different?
I hope this helps...
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Chris43, moderator