Hi Wave Glider,
Over the weekend I spent endless hours trying to resolve the question you posed about the Merlin fin you recieved and the smaller 9.5 fin we are having made by Futures Fins.  I found your template.  It was named HARBOUR MP and dated 11-23-09.  This is when the Merlin first was coming out and I needed a fin for it.  I also had the Plantain design in my head, but not yet in foam, so I named the template with the initials of the two boards.  The depth is 9 7/8".  The Super HP fin is 9 1/2" in depth and has 1/4" more rake and more tip volume.  I have several people comparing the two.  Both work rather well, and we may be splitting hairs on this one.
Below is a picture of the two templates.  I could not get right over the paper because of my shadow, but I think the picture shows the difference.