File Update without DirectLink

Hi,
Lets say a client sends me with Google Drive a 3D Revit File of a project.
Not using the Revit Plugin and the direct Link.

If i start to adjust the 3D File in Twinmotion and after a couple of days he send me the same file again, with some slight updates/changes from his side.
Can i then just update the File i already modified with the new/actuall File, or do i have to start all over again?

Thanks for Reply,