I watched the scenes three times where Cathy appears and also watched the scene where XNK0375 have her scenes.
In the credits in the beginning we see XNK0375 and she was underlined as ?Cathy Grener?
Here are the pictures which let me come to my conlusion:
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Picture # 1: The credits
Picture # 2 & 3: # Nicole Segaud and Cathy Stewart g/g in bedroom
Picture # 4: End of the pool game, watch the person I marked on the right side. She's the one which will have the scene with Jean-Pierre Armand in front of all others.
Picture # 5: This is the rest of the guests after the pool game. You see Nicole Segaud and Sophie Guers as the only brunettes. There are no others!
Picture # 6: The scene with XNK0375 and Jean-Pierre Armand
Picture # 7: Cathy Stewart dominatrix
After that scene (the butler and Dominique are finished peeping while Cathy dominate and have sex), the camera goes out to the landscape for three or four seconds and the poker game go ahead. Then a cut and you see XNK0375 have her scene in the pool room. This is a way to show us, that XNK0375 and Cathy (as the same person) have sex in different timelines.
I'm absolutely shure that there is no XNK0375 in the whole movie, just all the known actresses. Maybe I'm wrong, but I gave my best, watched the story and need other opinions
