I just got the LGRP scenery for X-Plane via the X-plane org store. In the sub folders for the scenery there are several alternatives for using mesh files but no mention about ortho4XP, although a respective LGRP.patch.osm file for creating ortho tiles is provided in the download, but yet no mention which Earth nav data file of the three should be used. The provided manual does not allude to this as well.
Another suggestion would be to include the four letter ICAO code in the name of the scenery.