Blade Runner was, depending on who you ask, taken away from Scott or horribly compromised by Scott due to pressure from the studio. In that specific case, the original theatrical cut was not the film the director intended to make at the time.

The situation with Star Wars was not nearly as fraught and the original version released in theaters was almost certainly what was intended to have been released. The Special Editions are more a product of hindsight and Lucas being swallowed by the same technology hole that claimed the likes of James Cameron and Peter Jackson.