You could take the page templates you have exported from one project and put that .doricolib file into the DefaultLibraryAdditions folder, then use the appropriate pageset.user… ID in the layoutOptions_scores.xml and layoutOptions_parts.xml files that contain your saved layout options.
The line in question looks like this:
<pagePairSetEntityID>string: "pageset.fullscore"</pagePairSetEntityID>
You would need to replace only the pageset.fullscore segment.