As Amy said, Google has a duplicate content filter. So if your first site is already in Google's index and you move that content over to your new SBI! site then the most recent could get ignored because of the "Duplicate Content Penalty."
So just make sure you only have one version of your content out there at one time. Of course if copycatters steal your content, there's no way to avoid that, but Google is usually pretty good about being able to tell which sites are the authentic ones.
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