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The maps were downloaded to your hard drive, not your gamertag, so as long as you are using the same console it doesn't matter. You will still be able to use them.
From my experience, DLC is NOT linked to your live account. I also have this map pack and am able to play it across ALL my XBOX Live accounts (my two accounts and my son's two accounts). That said, the DLC must be available to anyone who's logged in on the current system. So, creating a new account would not require you to transfer the data, unless you're creating the new account on a different hard drive/mem card.