Rogers Macklem FFK Missing Varnish

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I was able to obtain a few G.UNC Rogers Macklem FFK in the 987xxxxx range. 

These notes feel different.  They seem to be missing the layer of varnish that the $10 came with.  I seem to remember that the $10 were always thicker than the other notes.

Can anyone else confirm.  If so I wonder where the change happened.

I'd like to ask, do the FFL and FFP notes, reported on the SNDB, lack the varnish coating as well?

The FFLs that I got look the same without the varnish.

This is my personal research and take it for what it is worth.  I have to preface by saying that I was the first to report what is now known as the "double star hockey stick" on this forum.  I know that Rupiah did a lot of of research on those notes as well. 

I have checked a large number of FFP, FFL notes and can confirm that there is a difference in the feel between the two notes.  The vertical 10s have always been thicker than the rest of the polymer notes.

The FFL notes have a thin polymer.  The FFLs seem to have the same thickness as other non vertical notes.

I have also measured both the FFP and FFL with a digital caliper but did not measure a difference.  Both measured 0.1mm and different places on the note.

There is a colour difference.  The FFL (thin notes) have a lighter grey colour.  This is visible in the windows, the tower and the trees. 

These notes are not an error but could be considered a variety in the future.

Both notes where scanned at the same time.

All comments are welcome.