Stardust exists as a graphic novel (with Charles Vess art) and as a prose novel. The graphic novel came first (although technically it was originally released as a 4 issue prestige book mini series). What you are seeing are all the prose novel editions.

Never read/purchased the prose novel, so I don't know the differences.
I also don't know how the prose novel ties in with the movie.

'Reading' / 'Reading soon' stack: DC/Vertigo - ArtOps, Batgirl, Gotham Academy, Gotham by Midnight, Injustice; Marvel - Allred's Silver Surfer; Other - Abe Sapien, Descender, Fight Club 2, Goon, Mind MGMT, Southern Bastards