The DGT was built on the McCarty "platform". A guitar Dave spec'd out with PRS actually became the McCarty. Of course, the DGT evolved out of changes DG made through the years and specific ideas for his signature guitar. The specs don't "typically" change from year to year but PRS does tweak things from time to time. Also, those guitar bodies are all hand-sanded so depending on which employee was sanding that day, there can be slight differences. The necks are hand-sanded as well. I have two DGT's from 2008 and the necks on each are slightly different. One neck is a little smaller and the shoulders are shaped differently than the other. PRS is more consistent than most companies making instruments. But, with human involvement in the construction of the guitars, you're going to see some differences here and there.
