The questions will be similar between the two AOS versions. Some questions have been removed as some features have been removed such as the RF Plan feature that was removed from AOS 6.3. Some new redundancy features were also added in AOS 6.3, as such, there are new questions covering those topics.
I am sure you can understand that I cannot provide specifics on what the exam covers -- that would invalidate the exam; however, there are no surprises. All the material used in the course is fair game for the exam.