yes they can I did exactly that :)
You can
Yes.
First turn the guitar on and then connect it to the wireless receiver
Insert cord into the the hole in the cd port
yep
Yes.
Yes, Any Guitar Hero controller will work with any Rock Band game.
Guitar Hero World Tour is Guitar Hero 4.
Guitar Hero: World tour guitar length about 79,2cm
Guitar World was created in 1980.
Guitar Hero World Tour and Guitar Hero Metallica
Yes they do, I just got guitar hero world tour for Christmas and both guitars work with both games. Like the world tour guitar world with guitar heroes 3 and the world tour one and the guitar heroes 3 guitar works with guitar heroes 3 and world tour :) so yes is basically the answer! haha :)