I have long thought, that the white house tiara might be the one worn by Hilda von Baden. And with these great pictures which I haven't seen before I am quite convinced that it is the same.
So far, I have only seen a picture of Count Andreas Henckel von Donnersmarck, and the bride, Princess Johanna of Hohenberg, looked like she wore the Hohenberg diamond tiara. I would love to see wedding pictures of his siblings, if anyone could provide them.