Shadows of the Galaxy Booster Box vs Starter Set

With pre-orders opening for the Shadow of the Galaxy set, I’m wondering if there are cards you can only get in the starter set…

If you wanted to get Darth Vader and Luke you needed to buy the starter set of Spark of the Rebellion because they weren’t in the booster boxes (I think).

If they did the same thing with Shadows of the Galaxy then for example Mando and Grogu would only be in the starter set? Or is it still to early to know and Fantasy Flight haven’t told us the difference between the booster box and starter set?