Rock Band Gear

[alpha]

hi
the ps3 and ps2 controllers on rock band are the same? i mean i actually don't own a ps3 and i'm going to buy the ps2 rock band bundle, but i'm also thinking in buying a ps3 during next year, what i want to know is if i can use the controllers that came with my ps2 bundle on a ps3 rock band game or do i need to buy the whole bundle again?

thanks