With the exception of limited runs (Premier Dealer Network, BFRs, etc.) the way usually works with EBMM is that the production model only changes if the artist actually wants that change. For example, if Petrucci changed his choice of string gauge, the production instruments did too. When he changed pickups, the production instruments changed too. When the LIII first came out it had an all-rosewood neck. A year or two later Lukather decided he preferred roasted maple and so the production instruments changed too.