In short, no. The uniqueness of the Rosicrucian teachings does not come simply from the body of knowledge it offers, but from the way in which it is organised to produce a genuine and permanent evolution of consciousness. This is a good reason for the word "order" in our name. Each topic covers important steps needed to derive benefits from the topic following it..., and these steps should ideally be studied and internalised sequentially, not in parallel.
Knowledge is one thing, but learning to apply it to daily situations and mastering the techniques the Order suggests, is quite another matter. It is imperative therefore, regardless of any previous study and experience, to begin at the beginning and to follow the curriculum as laid out. If you really have advanced some way in the fields of mysticism and metaphysics, then happily for you, you will be able to absorb and internalise the Rosicrucian teachings and techniques just that bit faster and more thoroughly.