PlumePack

The Project Manager doesn't copy the media used in an AE comp linked with Dynamic Link. Is is the same with PlumePack ?

PlumePack copies the media dependencies of the AE comps (imported media in After Effects) into the same subfolder next to the .aex file. Those files are not replaced in the AE comp though and you will need to relocate manually in AE. The aex file itself is well copied and replaced in your premiere pro project.
Full comparison with the Project Manager in this article.