I already asked the question in the CHFB :
I've read (In several French books & mags) the claim that "one of his most beautiful sequences" of the Lewton-Tourneur classic "Cat People" was excised from the film's final release: the nocturnal meeting of cat-women in the museum.
But I've never found any evidence that this was ever filmed. There are no such scene in the shooting script... Was the whole story just a myth? If so, where did this rumor begin?
I just read an old 'making of' article from 1981 that makes no mention of it
( although does mention after previews they decided they needed to film & add some shots of the panther in a scene ).
First I have ever heard if it myself.
If it's not in the shooting script it seems it might be more like a myth....
There was a scene deleted from the 1982 remake where Irena meets her half panther mother, which sort of fits what your are describing.