You can play Rock band with a guitar hero guitar, but you can't play Guitar Hero with a Rock Band guitar.
If the controllers are for the same system then just plug it in or turn it on and play.
The same way you play with a GH3 guitar
Guitar Hero World Tour is Guitar Hero 4.
no
Guitar Hero World Tour and Guitar Hero Metallica
No Guitar Hero Aerosmith is a standalone Game. You do not need the Orignal GH to play it
yup
Yes
no. guitar hero 2 is just a better version of guitar hero 1.
No. You have to have a guitar (Can be "Rockband" or "Guitar Hero" guitar or a drum set.)
Depends on what system you have.