If you are able to bring over the server ID numbers (Preferences.xml) and everything INTACT,
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HAVING turned off ALL automatic library updating functions before copying.
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AND create the Plex/Library/Application Support/Plex Media Server structure
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THEN installing Plex Media Server 1.24.2.4973 or higher,
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The Synology installer will “migrate” all the server internal files to DSM 7 format for you.
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The only task remaining for you will be to update the media locations; switching from Windows paths to DSM 7 paths (local paths) … per the 'movie media to a new location
You’ll have your media and Server instance on DSM fully operational, without the any visible change to the users.
Here’s where I detailed the process for another user.