I can confirm that all 3 work on XB360, however the Thor (2014) cheat says Thor (Classic) when unlocked. I haven't had the chance to see it yet so I'm not sure how he looks. Also it said Hydra Agent when unlocked. If you have anymore, I'd love to test them!
You enter the code, then go to extras and turn it on. It will stay on and double your studs until you close the game. Next time you play you'll have to activate it again. There are multiple levels of this brick in all the other games, 4x, 6x, 8x, and 10x. They DO stack for a multiplier of x3840 when you have them all unlocked and turned on.