I think the bracing of your guitar is pre-standard II. The X is not as close to the sound hole. Maybe an inch or so difference. There is no relief rout on the top. The relief rout is a slight thinning of the soundboard near the sides. It allows the top to move a little more. The final neck carve and sanding was done by hand, so there are slight differences in how the neck feels. I have a '98 714-CE, and the neck is a bit thinner than all of the NT neck guitars I have had. My guess is your used guitar sounds different than a new model. I prefer the pre-NT neck guitars, but I have a current model to use the Expression System for live playing. I used to happy with the Prefix Pro or whatever they were using at that time, but once I used the Expression System, I was sold. Just this morning I was once again amazed at how much better it sounded than my 714-CE electrified. But as far as the straight acoustic sound goes, I will never get rid of the 714-CE. Nothing beats it (unless I want to spend $5,000 +). The only reason I got the newer model GA3, is because I was tired of the dings that go along with playing away from home. The GA3 is expendable.