Final Fantasy XIV Database - Ffxivpro.com

Yes, additional furniture of that particular element of your currently active moghancement will enhance it's potency however the additional furniture's seperate moghancement strengths cannot overwrite what you have currently active or else it'll go onto that one. Make sense? Kinda makes me wish SE would just let us pick our own moghancements on the list of what's available instead of yanking out and throwing in furniture for when we wanna craft or whatever.