Yes they are 100% compatible.
no it will not work due to the fact that it was made for the electronic pattern of the second game. the third game has a different electronic pattern that allows for better sound. there will be...
if you have the 60gb model of the PS3 which includes backwards compatability then yes it should work
If the aerosmith guitar is for PlayStation 3 than yeah it will work. But not i its an Xbox guitar or wii guitar.
well you can use the controller but its a better expirence if you have the guitar