How to copy a compositions

There is a warning banner indicating three expression errors in the screenshots. Could this account for the difference? Did those errors exist before you ran the duplication script?

If the True Comp Duplicator script does not work as expected, try importing the project into itself.  This duplicates everything in a folder with the name of the project.  Carefully remove anything not used with the duplicate Comp and revise the duplicate Comp names with something helpful to distinguish between the originals and the duplicates (a renaming script can help).

If the current project would have a lot to clean up, use File > Save As to be working in a different project.  Save next to the original project and change the name to same name as the Comp being duplicated when you do Save As.  In the Save As project select the Comp being duplicated and choose File > Dependencies > Reduce Project.  This leaves only what is used in the Comp in the Save As project.  Save that change, reopened the original project, and then import the Save As project.  When the original project is open and has been saved, the Save As project can be deleted from the Finder or Explorer. 

Hey Alexander,

Please check if any effects are applied to the composition by selecting it and going to the Effect Controls panel. It could be that the script did not duplicate the effects along with the composition.

Thanks,

Ishan

The first screenshot shows the timeline at a different time than the second one. Do the comps really look different also if you preview the same frame in both of them?