I'm with you Jim. I have looked at them under a microscope and they look a bit different. And others have posted microscope images of these blades that show them to be a bit different. But I would venture to guess that if you looked at two Polsilvers from different batches a few years apart, they might look a bit different too. Anyway, I agree on two things. (1) They both shave the same to me. (2) They are my favorite blades.View attachment 1347854
Wizamet SI
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And/or Polsilver SI.
In my view, they're the same blade.
(Yes, I know some folks say they're not the same the same blade, but my skin says they are.)
I already use only these blades.
Happy shaves,
Jim