Literary sequel
In short: A new work that starts from an earlier story’s world and carries its events forward.
Term
How does it work in the tale?
Jules Verne makes Poe’s novel a book his characters can read. A detail from the earlier book becomes a clue for a new voyage. I’m Black Horse. Which unanswered question would you follow?
How can you recognise a sequel?
A sequel asks what happens after the events of an earlier story. A retelling may revisit the same events from a different angle. Verne recalls Poe’s ship and passengers while starting Jeorling’s voyage at a later point. The reader returns to a familiar harbour with a new question.