Sorry for the belated reply, work owns me. As an aspiring Darth Vader 501st member, there are actually 4 different Darth Vadars for each of the movies ie. time periods. I won't bore you with the details, but there are differences in his helmet, chest box, belt boxes, shin guards, gloves and etc. Now perhaps Lego has changed the chest armor, but they lack other details. For instance, with the SSD set, Darth Vaders chest box has a green and red light, when in all actuallity it should be blue and red. There are alot of othere minute details that Lego would have a hard time portraying, but they could at least make that change to fit the time period.