I can't think of a way to duplicate all the threads from one forum to the other. You could do like this site does and have a "Click here to view the latest topics" link at the top of a Category that contains the Vegan and Vegetarian forums and then if the users are Vegan, have them not be able to 'see' the Vegetarian forum so when they click on the "Click here..." link, they only get the Vegan threads, whereas the Vegetarians get to see all the threads. I'm not sure how your site is laid out, so who knows if that would work for you.
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