[jjd-uk]

There is confusion because it's not clear how each of your installs accesses the files. However despite this black_eagle has told you how to figure it out for yourself, that is on your CoreELEC Odroid N2 create new simply playlist using the music file locations the Odroid N2 has access to, then compare with the m3u playlist generated by the CoreELEC Odroid N2 install with your Mac OSX itunes m3u files. That will tell how the path subs need to be configured.

xm:
 <pathsubstitution>

  <substitute>

    <from>itunes m3u folder path</from>

    <to>Odroid N2 m3u folder path</to>

  </substitute>

 </pathsubstitution>