I was running EQ Match of some ISO guitar tracks off his various records against mine, and I noticed pretty much the same EQ shape kept coming up over and over again. What's really weird about it is that this shape always happened regardless of changing variables - changing guitar, cab, mic, amp head, etc., etc. By and large, I would get some variation of this:

(This is the sum average of all the various EQ matches I did)
What's funny is that if I apply that EQ curve to my guitars, they sound like complete ****. However, if I used the guitar ISO tracks with bass/drums recordings I've done, his guitars sound a leve better than mine in the mix, even running through my Master chain (so, don't give me anything about these individual guitar sections having been Mastered and that's where the EQ curve comes from).
Any thoughts on what is being achieve here? I feel like I've neutralized all of the variables, and this is driving me nuts.