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The bold text highlighting your conclusions is exactly right IME.

I'd keep both. Instead of lapping with a diamond plate, or sandpaper, I'd rub one against the other under lightly running water....

IME sometimes it takes a lot of time to sort out a coticule. I have a La Veinette I thought was a dud until I did about 180 round trips on a Theirs-Issard super gnome and got as good an edge as any...