That Aria in the second pic from the Motorsports show was not a Les Paul at all, but an Aria Pro II Cardinal Series. A bit different......
As for Cobain playing Les Pauls......I heard he had one, an Ibanez Les Paul copy, that he may or may not have used on In Utero for a song or two. The picture up top, that could be, but unlikely given what Kurt said about Les Pauls per most people in here.
A lot of rock stars use different guitars live than they do in the studio. Like Hendrix used strats and flying V's (later on) live, but Hendrix used all kinds of stuff in the studio, Teles, Jazzmasters, Danelectros. I've seen David Gilmour using a luthier built 24 fret guitar in the studio for Dark Side of the Moon on the Pompeii video we have. Paul Dean of Loverboy used to put a whole bunch of crazy home built creations together between takes/tracks in the studio so you never knew what he was using on the record for sure. I've even done it as a local artist - Tele Custom in the studio, okay, let's play that. Oh, the bassist wants me to try out his Gretsch DuoJet on this track - sure.
A lot of what's on the web is speculation. But I can't doubt there are some Cobain guitars that never saw the stage but got used on the albums. I'm still thinking Very Ape is the Musicmaster that Dave Navarro has given the whole song is on a neck pickup.
