I don't think that his change of the guitar that he uses influenced his change of style. Rather, I believe that his change of style influenced the change of the guitar that he chooses to use.
I believe that bigger things in his life changed his style rather than his guitar.
"Anyone who plays a Strat is a sick masochist. Anyone who doesn't is a p****." -Jeff Beck
Something like that anyway.
The sounds for Blue Album are all Gibson guitars.
I'm not sure about Pink and Green.
Like Elliot said, Rivers' style changed, so he changed guitars. This was before Maladroit came out, on the Extended Midget tour, when he started playing a Flying V and an Explorer. I f'ing love Maladroit, so this doesn't bother me that much.