don't know wht to say about that. Why do they have to be indenticle guitars. I can compare the tone of a dread to an OM all day long. Howevr, the strings make a huge difference and if I were to really do a good comparison, they would both need same strings for sure. Here is what I posted on another forum that gives answer... might make sense after you read it.
I realized that guitar B had old elixers on it and the wound strings are indeed blanketed.too bad. ... would do a comparison at some point with same strings, but in case I don't, here is what B sounds like with good strings
this is from my last cd "Tryin' Man" http://www.soundclic
you can go to http://markcrawfordwilliams.com/
and just click on Tryin Man and sample all the tunes. YOu can hear it strummed, fingerpicked, and also flatpicked (with some solos). It is the only guitar I used on the entire project. Did not have the new one yet and it probably would not have made much difference. Guitar B is the best recording guitar I have owned. It is indeed the Gibson OJ reissue that I have had for a while...love it. Guitar A is a custom j45 copy that was made thinner for me. I also had some brace work done on it by Bryan Kimsey and it really opened it up. It is definately still "green" or "tight" and I am not sure that it would not be best with lights (even half step low) but it has medium lights on it. I like them both, but the Gibson has more sustain and sounds very even top to bottom with good strings. The other one has more high end bite believe it or not but the mids are really coming and it is going to be a great sounding guitar. In about a year, this guitar will be super I think.
PS. I have another comparison I did of them with the same strings I think. But it was before the modifications of the Red-Line and it is a much better sounding guitar now after Kimsey's work. I will try to find it...neat to hear how it has changed.