This is my own fault... But now I will have 2 pay monthly sims.

As soon as pre-registration for pay monthly was open I registered my interest. And as soon as pay monthly was released on the online shop I ordered one of the pay monthly sims for $10. (Of which arrived today). But today I checked my emails and saw one from 2degrees. I was really in too much of a rush to read it and just saw that it wanted to confirm my address. So I clicked on the Yes, thats right button and then saw a message saying that my free pay monthly sim would be on its way. I then went back and checked what the email said and it was about the fact that I registered early that I was entitled to a free pay monthly sim pack.

Serves me right! I should have read what it said. But what I am wondering now is if there is ANY difference at all between the pack that I paid for (the one I have now) and the one that will be in the post?

Will I be better off using either of them?

What should I do now? - My brother is coming over from the UK in a couple of months and will be wanting a pre-paid sim. Would I be best to leave one unactivated (if so, which one?) and then activate it as pre-paid for him? Could I then 'cancel' that sim after he has gone? (He will be here for approximately 3months).