Finding listen and read books (Immersion reading / Whispersync for Voice / Librivox)

How do I actually find books I can listen to and read along at the same time?

I'm looking for books in Spanish in particular.

I found that The Raven by Edgar Allen Poe is a completely different version on Librivox than the one on Project Gutenberg.

I can't see a way to search for these books on Kindle or Audible: only after having found a book.

How does one search for books that have a direct match?