OK, here's an idea.  Load the first light set.  Select the lights, one at a time, and choose Edit, Copy.  Open a notepad file and choose Edit, Paste.  That will record of the light properties.  Continue until you have all of your lights recorded into the notepad file.

Load the second light set and add enough lights to cover your first set.  Say there were three lights in your first set, add three lights to your second light set.  Carefully copy light information for the first light in your notepad file, select the fourth light in your scene and choose Edit, Paste.  That should change your second set, fourth light, to the first light of your first set ...

Continue until you've gone through your notepad file.

I tried this with the default lights in Poser, copied the first light into notepad, selected the text from notepad and pasted it to the second Poser light and now have two lights with the same properties ...

Best Wishes,
Rªnce