Korriban has been established in the lore for many years and a great amount of books, comics, card games, video games and other products refer to it as the Sith homeworld. In my opinion such a massive retcon would need a very serious reason to justify it otherwise it is an unnecessary compromising of heavily established canon.
"Massive" retcon? There have been bigger retcons made in the past. Once upon a time, Boba Fett was an alter ego that renegade stormtrooper named Jaster Mareel made for himself after he chose to become a bounty hunter. "Moraband" is a simple name change. All in all, this'll be one of the easier retcons. As said ad nauseum
before, it's not all that uncommon for planets to have more than one name.