The 2 mics might have been recording the same guitar piece being played, but those two tracks are different. I'm assuming the mics were at different positions or you had different mics. In that case, they don't sound the same. They each have their own frequency response and EQ. If they do sounds too much alike, tweak the EQ slightly to get a different sound out of the other. It will help give a little depth.
I personally don't like "hard" panning. Depends on the tracks, but I usually settle somewhere around 3 & 9 o'clock for left/right. Good luck!!!