Despecialized Edition uses original film sources, and so does Team Negative 1. The people working on the Despecialized Editions are familiar enough with the theatrical sources that I bet they’ve got it accurate, and they also have all of the original audio tracks to my knowledge so those would include the extra “standbys”. I have a similar memory of seeing Willy Wonka and the Chocolate Factory at a young age, and I swear that Gene Wilder actually physically kicked Augustus Gloop into the chocolate river. Sadly I didn’t see Star Wars in theatres though