Does it matter? I've seen one Potter movie and forced myself to sit to the end. Forbidden Journey is a stunning attraction that I can ride time and time again.it's a gigantic stretch, the Yeti is something that entire belief systems have been centered around in the Himalayas for hundreds if not thousands of years. I bet you can't even give me the proper names of the creatures in Avatar without having to google them.
Doesn't matter about the movie. A great attraction will stand on it's own merits.