If you are just interested in new .pm files, it's enough to compare the list of files in an old and a new version of a distribution. Usually all files in a distribution are listed in a file called MANIFEST.
However there can be multiple packages per file, searching for those would be more work.
You might also be able to snapshot versions of the modules/02packages.details.txt.gz file found on your CPAN mirror, and compare those versions.
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Try Super Search.
You'll find threads explaining how to id the core modules... and how to find all modules.
Update: Moritz reply makes me suspect I misread the question. If you, indeed, meant to track changes from version to version or to id differences between distros, his answer is on target (++) ...and this, which addresses additions to your local Perl, is on the wrong track.
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