Its new teritory for them, its normal boar behavour. Where ever they were before, they would have sorted out who is top pig in their home, but now they are in a new one, this has to happen all over again.
Maybe this thread might help you: http://www.theguineapigforum.co.uk/showthread.php?t=28949
I recently had a little shift around and put two of my boars in a different cage Elliot and Fergus) They are very much a bonded pair, but they did the rumbling thing as they were in new surroundings. It didn't even last for a day, just until they were comfortable.
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