Change keyboard layout

Hi! I've had a Macbook for quite some time, and it just died a few days ago, so I got a new regular white Macbook.

The thing is that the new Macbook's got a different layout for the keys- the latin american one. Physically I mean. The keys look different, the symbols are all over the place and I'm having a seriously hard time using it.

Is there any way of changing the keys to the american ones? I still have my old notebook, so I can always change them by hand, but even so the white plastic thing around them has a different shape. Would that be a problem?

Thanks! I hope that wasn't too cryptic to understand

 

It's QWERTY, but the rest of the keys are off... I mean, I got the latin american qwerty (didn't buy this in the US, I was going to order it from the Apple store but it took like two weeks to be shipped down here, so I had to buy it from the local Apple Store).