From publisher blurb:
The contents of the Savage Worlds Deluxe: Explorer's Edition and Savage Worlds Deluxe are the same. The Explorer's Edition is formatted for 6.5"x9" while Savage Worlds Deluxe is 8.5"x11".
Savage Worlds is a Fast! Furious! and Fun! rules system for any genre of roleplaying game. Create your own setting, convert an existing one, or pick up one of our amazing worlds like Deadlands, Slipstream, or Weird War II.The rules give players plenty of depth to create their characters and keep bookkeeping to a minimum for the game master. If you're looking for a game that's fast and easy to set up, run, and play, Savage Worlds is for you!
Savage Worlds Deluxe is the newest edition, providing an update to the third printing of Savage Worlds Explorer's Edition. It includes rules updates, new rules material, new art, more examples, an expanded Setting Rules section, Designer Notes to give you an insight into the development, and much more. It does not, however, invalidate prior printings of the rules, which you can continue enjoy.