I do what a lot of people do and thats pan 2 guitars one hard left and one hard right. Now I know you never want to record one then copy it to another but what about recording both tracks at the same time Does that change the sound?

I have a Line 6 head with two XLR outs I can assign to different models. I set it up so that I have two different clean signals outputting and record both with a different but similar VST amp sim setting for each track and pan them. Seems to work splendidly. Not sure if it's appropriate but I like it. Also I think even if you clone a single identical track you can avoid the problems associated with that method by nudging one slightly forward. When I used to use the clone method though without a nudge (before I knew better) I always set my sims differently anyway and that, although not great, seemed to work okay. You kind of have to use the same performance for lead tracks if you intend to pan them or you are a guitar playing robot.
 
Just my thoughts on the matter... but I'm still learning.
 
;-)

Another option if you record a guitar track using software amp simulator plugs is to clone the track, set up a different amp/fx on the cloned track then put a chorus set very mild and fully "wet" (so there's no dry signal) in the fx bin/prochannel in front of the amp sim.

I've recorded two tracks at the same time using two different mics.  To tell the truth, that works ok if you just want to blend the two tracks for tonal reasons and then pan them BOTH in the same direction.  After that, I record another set of tracks and do the same thing except I pan in the opposite direction.  The differences in the two separate recordings (performances) helps to isolate the tracks left and right for a wider stereo field.

Exactly, recording has such a learning curve. Its easy to record but hard to make it sound great BUT FUN!!!!!!!! I have seen many videos recording then copying and then record each same track 2 to 4 times and there is a difference in sound.

Thanks guys, I am using the Axe Fx 2 5153 Red preset and it kicks.

Another secret is to copy the original track to a new one. Then slightly shift the entire new clip just milliseconds out of time with the original. If you shift it too far it will sound like a digital delay. Shift it just enough to hear the difference between the two while panning hard left and right. If you want a different texture use the EQ. This technique makes for rock solid syncing of the performance on the two tracks. Quite often you will not get EXACTLY the same performance by manually doubling the track. But that is sometimes what you want. The little discrepancies make for a more live feel. 

It depends when you're looking for - yes, you can record both tracks at the same time as people have outlined above, but they'll sound exactly the same - if you use different sounds, that certainly helps mix it up a bit. 
 
If you use the method described above to nudge one track over a bit, so there's just slightly different from eachother, that will fatten things up a bit more.
 
I personally prefer to actually recording the tracks separately - the subtle nuances in recording it a second time will distinguish it from the first guitar track and make it sound the most natural and biggest (IMO).
Russ
 

Thanks guys. Love the feedback.

I always record as many tracks as I want in separate passes.
It's quite common for me to use completely different setups for each pass - different guitar/amp/pickups/settings/Fx/mics/pre-amps etc
 
Anything to get a different flavour, but the key is to introduce subtle timing/pitch discrepancies as this is what fattens up multiple tracks
 
I've never had much luck at all with the "clone & nudge" strategy, it just makes it louder and doesn't introduce those little variables you get from recording multiple take