I did a quick and not exhaustive internet image search and the only time I saw MJ dressed as Black Cat on an official Marvel cover is Mary Jane and Black Cat, where the costume is part of the story.
J. Scott Campbell has drawn MJ in a tiger suit.
Regardless, it’s the same issue: treating female characters as interchangeable objects. Just pop the heads off the dolls and switch them around.
MJ and Felicia have the exact same personality and would make the same quips (and Black Cat was introduced with that pose)? That seems to be saying they are interchangeable…?