If you are wondering whether you may have the fanlistings on the same page with the same layout, that is permitted. BUT you must make sure that you are still running two separate fanlistings for the same subjects and make it very clear that there are two places to join, two members lists, etc.
I did a similar thing with a fanlisting I used to own, and I basically had a joint splash page that led to the two fanlistings. However you do it is up to you, just please make sure you aren't combining the fans in the listings, they must be separate.
Hope that answers your question :frustrated: