Quote: I have three sets of barrels which I believe are all Tikkas
If so, they'll read Tikka.
Quote: As said I believe all three - Valmet, Tikka and Finnclassic barrel sets will all function after fitting.
Yes. I seem to recollect that barrels between the Valmet 412 and 412S series are interchangeable w/o fitting. This was one of the finesses when introducing the improved S series. Not 100% sure on this, though!