Difference between project merge and object manager? | Microstrategy

1. Object Manager can move just a few objects or just the objects in a few folders. Project Merge moves all the objects in a project.
2. Object Manager must locate the dependents of the copied objects and then determine their differences before performing the copy operation. Project Merge does not do a dependency search, since all the objects in the project are to be copied.
3. Project Merge can be run from the command prompt in Microsoft Windows.