On the old forum, Alistair mentioned how they change the top design to improve sound and I think that's ongoing with most of the CF builders. It's such a relatively new process building these guitars compared with the long history of building for wood.
I remember the Lucky Thirteen blues guitar was redone intentionally to produce a noticeably different sound that many players preferred. It's a well balanced guitar, IMO.
Guitars from the same design era should sound very, very close in sound quality--so you are right when mentioning that comparing two guitars from one builder that were made years apart can certainly count for a difference in the sound produced.
But there really shouldn't be much difference otherwise as there wasn't with the two Emeralds that I compared side by side.
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