The mac aura is in the default library of the hog. If you want to use the Ext. version you need to patch 2 profiles for one fixture. First you patch the Mac Aura Standard and then the Mac Aura Fx directly after the standard profile.
If you have 10 of them you create as example fixture 1 thru 10 as the Mac Aura Standard and then fixture 101 thru 110 for the Mac Aura FX (the lens FX). Then you patch fixture 1 at 1 and 101 at 15.