They look perfect together! These are the Aussie covers. Which I like better than the US ones (Finnikin and Froi. Quintana's US cover is not out yet). I'll post the links to Amazon and Goodreads for Finnikin and Froi below. If you haven't read them yet, you HAVE to like, right now!
I like these covers too, but the Australian covers compliment each other better.