The Yamato in "Where Silence Has Lease" was NCC-1305-E, though that was an illusion generated by Nagilum. It checked out as far as Riker was concerned. The real Yamato was seen later with a different registry.
Still vetted by the Trek copyright holders. If they had some sort of "only the Enterprise can have a letter" rule, it wouldn't have been allowed.^T'ain't canon.
I thing it's a shame that the uss Sao paolo in the seventh season of DS9 was renamed Defiant NCC-75633 ant not Defiant NX-74205-A
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