So I have an '08 version so I'm thinking these would be pretty close. So it will have a 4th preamp tube vs the OG versions which had 3. One being a Phase Inverter of course. The extra preamp tube added in '06 time frame was actually to give the clean channel a dedicated tube if I remember correctly - which then frees up one triode for an extra gain stage. I can't remember the year that Scott started putting in the 'master' loop volume control but I believe that would have been after 2011, probably closer to 2015 he did that. Then, after that, he started offering the B+, mid cut, and old/new switches. You can ask seller if it comes with the 3 button footswitch. Also, what speaker cabinet(s) would you be using? Because most agree that Splawn mids do not mix as well with Vintage 30 mids but some like them just fine. I would also ask what transformers it has - although that would be more curiosity vs quality/tone.
Hope that helps and good luck.