John,
Yes, and it involves doing nothing
; PM uses the information saved inside the image files (or xmp sidecar files for RAW files).
Of course, this assumes Lightroom wrote the keywords/other IPTC info back to the files , but afaik this is always done by default. If in doubt, explicitly tell Lightroom to update the file info with the content of the Lightroom database. This is an option somewhere in the menus (don't know the exact one anymore as I don't use LR anymore).
Hope this helps