I tried a GAD M20 I should've bought. GREAT lil' ol' mahogany guitar. It even had "character," in this day of generic imports.
And I tried out a GAD30R which was very nice, except the former owner had some pretty light strings on it and had not addressed the trussrod, so the action was too low and the sound got compromised in there somewhere (not the guitar's fault). The workmanship and features were all top drawer though. No scarf joints, stacked heels, or other shortcuts in materials or workmanship, vs so many "name" imports. FMIC seems to be paying attention to QC and details.
Recently I found a New Old Stock D40 made in Tacoma Washington. I bought it because it was fully a world class dreadnought that could compete with any other production guitar (and some luthiered high-dollar guitars), and was cheap for what it was I figured -on its own merits (like a lot of Guilds, I think). I couldn't be happier with it. With the dead strings it had on it I could tell it had that Guild authority and cushy bass "thrumb!" When I put new (light gauge) strings on it the sound came alive like a Grande piano. Astoundingly good.
Locally there are at least three older used Guild mahogany dreads for sale in stores that each have slightly different tones (likely strings) yet are what Guild dreads "sound like." Each is made in a different era, and factory. Some are heavier than others, and one has a big neck at the joint, but they also have a certain consistent authority and cushy bass "thrumb" to them, and the necks are fine (one has been reset).
I don't think Martins are any more consistent from having been built in the same factory over the years. The new Guilds coming out from New Hartford plant have the same specs as my Tacoma-built example (and I believe the specs didn't change from Corona, CA either). I'm not sure there's any disernable difference, having not run into any New Hartford D40's yet. But I'd be willing to bet at least to my ears the dreads will be very familiar sounding. It seems to me FMIC is concerned about keeping Guild in the hunt, and that means consistency in the Guild "sound."
So I'd say (to answer the OP's original question), "No, I don't think it matters..."