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I like Coraline better, because of the book. I don't think there's a problem with having two 'c' names in your family - it's not like they're matchy or you're trying for a theme, they're just two names that you love.
I'd probably use nns with Coraline and Caroline. For Caroline maybe Caro or Callie (or maybe Carly at a stretch), and for Coraline Cora or Coco.