In the Design Collaboration module, you can compare changes between models that were delivered in two different packages or between consecutive linked models on the timeline.
The timeline highlights the nodes to indicate which nodes are being compared.

Changes are viewed using the Change visualization interface in the viewer. There are multiple ways to open the Change visualization interface to compare changes:
To speed up a package review do the following:
View a document in a package.
At the top of the display, click Show changes.
Changes are also available without opening the package:
Select a package from the timeline.
Click Show changes to compare the selected package and the previous package.
icon on the left side of the screen.When you've opened the relevant models or packages, use the Change visualization interface to review the changes.