I'm not exactly sure about this (because I read those books a long time ago), but:
Aren't they both in the same time period and both set in England/European countries?
Oh, and one thing I'm sure about is that they both have mythical creatures in them.
I drew a picture of the anime character Kallen Kozuki and I wanted to paint it with watercolors, but I've only got those cheap ones that you get in a kid's craft section (because I don't have money for better ones or knowledge of where to get them without ordering online). There's about twenty...