I started opening these up and since I have two sets to open, I was really hoping that Hasbro had done us a huge favor and made it so the two new Galen Marek figures could be used to supply new heads to the two figures from the Vader's Apprentice Evolutions set.
Unfortunately, neither new head fits on the ball for the "Light Side" version of the Apprentice. So that's out.
The head from the Junk Planet gear version of Marek will work on the body from the initial outfit figure, but it sits alittle "low" on the neck and that figure's head works fine on the new figure's body, but rides too "high" so unless you pitch the head forward the shoulder wrap doesn't cover the nose and mouth.
For people like me who are buying more than one set to have multiples of the army builders, it would definitely have been a nice bonus if I could have used the new Galen heads to update the Evolutions set figures.
The sets are great though, I am very tempted to score another two sets just so I can four of each of the army builders (eight in the case of the cloaked Stormtrooper).