To use 4D animation to visually compare a planned vs baseline schedule, you will need to baseline create a baseline of the schedule before synchronising 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 the videos below to see it in action:
Compare using side by side windows: https://youtu.be/4q9flA-mMA0?list=PLwivaFFXYOsFIn6S2anPYFxLOgPC2uzsJ