[ntropy]

Did you actually export the song playback history? You exported to a single file, but what items did you choose to export? If ratings and playcount and last played are not importing that I suspect that you simply didn't export them.

If that is the case and you still have the SQLite db file then you can temporarily point Kodi at that database, export the song playback history (only songs need exporting), point Kodi back at your Mariadb and import your newly created xml file.

I selected everything.  I've been re-organizing music files since the export so the chance for this to work has probably passed.