Howl and Stardust? Nothing, as far as I know: they share the Donne SONG, but then, that’s something that both Diana and I loved.
As for how much of my writing has been influenced by Diana? All of it, by her as a critic, by her as a reader, by her as a friend. I don’t think it’s possible to underestimate how much having her to talk to about writing and stories meant to me over the years. I miss her very much.