I also doubt that general displacement principles strictly transfer directly to catamaran hull forms. I believe this has been a limiting factor in the development of catamarans over the years. Generally, classic displacement hull profiles are too radical IMHO, dictating too much rocker, and bow and transom lift resulting in the classic hobby horsing seen in early cats designed using these principles.
Not being an marine architect I can't back my suppositions with technical explanations, only experience and Logos.