ah yes, it seems you were all right, I was wrong
I confused with the bass : in the booklet behind some lyrics, and on the 2nd pic
But on both pics there's another guitar on the armchair which looks like the same model (neck with "nacre" frets, and PU switch at the bottom horn), so the 2 guitars could be some borrowed models, and not exactly the firts Mark's guitar.
I can't recall exactly, but I remember reading something like that at the time KTGC was released.
I believe there are more pics, not featuring on the booklet, there was some on Utas's ite I think, but it doesn't work anymore