I think the OP wants to know if a $5,000 Gibson Les Paul sounds significantly different than a $1,200 Gibson Les Paul.
The answer is partially what everyone has already sais ("no two guitars sound identical," etc.) But if you are asking what I think you are asking then the answer is no, not really. Two Gibson Les Pauls with the same specifications for neck and body wood and the same pickups will sound pretty close no matter which "model" each is. The studio faded Gibsons sound pretty much just like the much, much more expensive shiny reissue models.
I know there are Les Paul owners who will swear forever that their $10k model sounds better than any "ordinary" Les Paul. It might, but if it does it is likely because they lucked into one made from wood that sounds the way they like. If they spent a few hours playing used Studios they might come across one that sounds just as great for $600.
Of course, there are Les Paul owners who swear the sound of their guitar changed dramatically when the changed the tailpiece studs, too. I suspect none of those guys ever actually play on a stage with a band.
If what you want is a "good" Gibson you just have to play quite a few until you find one that sounds, feels, and looks the way you like. It took me 3 SGs to find one I loved when I was shopping for one years ago, but more like a dozen 335s before I found The One.
If you are not sure about buying a particular guitar, then it isn't the right guitar for you. When you find the right one you pretty much know right away.