It's hard to be sure, because I know so VERY little about Anthroposphy--I haven't read Steiner, and I didn't study at a Waldorf school after the age of 7. But from the perspective of a very young child, there's just so much that is in Narnia that is also in the Waldorf curriculum. (For instance, I learned basic arithmetic via a series of fables about dwarves.)

For the most part, what they have in common is that they're very spiritual adaptations of Christianity that stray incredibly far from the religion as it's traditionally practiced but are nevertheless thoroughly steeped in it. No criticism of the "secret Christianity" in Narnia has ever come close to the sheer wtfery of saying morning prayers to the Sun God Who Is Totally Mithras and Not Jesus We Promise But Wasn't His Resurrection Awesome?

One of the most important books in my early development was The Seven-Year-Old Wonder Book, a series of short stories and fables about the best way to live your life. It has the exact same blend of neutered Greek myth and vaguely Christian metaphors that I came to know and love in the Narnia books. To this day, I can't always remember which series is the source of certain stories in my personal mythology. Lewis was a much better author than Wyatt, though.