To use a 4D animation to visually compare a planned vs baseline schedule, you will need to create a baseline of the schedule before synchronizing from the updated schedule (or entering the update directly in Synchro). You can then open 2 side by side 3D windows and set Dates to Use to Baseline in one of the windows. As the focus time plays the 2 windows will show the differing dates for the planned and baseline schedule.
Watch this video to see it in action: