The cables are the same, yes. That means all you need to do is grab an appropriate PSU. If you search for a "USB wall charger" you should be able to find a charger that fits your needs and has a plug that fit the electrical outlet of your country of choice Just make sure you get one with a lot of knowledgeable reviews (to make sure you don't buy a charger that claims more than it can deliver) and one that provides enough mA. 500 mA is more than enough for the model A, and should be enough for the model B as long as you're not using USB peripherals that need a lot of juice, but 800 mA is a better safety margin for the model B.
Of course, alternatively, you could grab the power charger from the R-pi store and know that you're getting enough power and know that the PSU isn't a lemon
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