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"... in fact, MOST of them are exactly the same."
The key word there is most.
A Skopar is a Skopar, whatever it's on. A Synnar is a Synnar, no matter what it is on. A Sonnar is a Sonnar, no matter what it's on, and so on. Digitally integrated lenses, of course, are different, but I believe those are still in the minority.