I mentioned in the Lovely Kitty article that there were several alternate versions of this particular Polly Pocket knockoff, using the same molds with different names and different paint jobs. The others are Pretty Pixies, Petite Princess, and Betty’s Club. I suspect Lovely Kitty was the first — her name is still featured on the Betty’s Club version of the tennis/yacht race set.
I’ll be updating this post as I make new discoveries.
The first variant I got is a Pretty Pixies beach house with an easter egg colorscheme. I’m happy that the umbrella was intact. I later picked up a Petite Princess version of the beach house with a grim blue-and-burgundy horror-movie-night palette, and a Betty’s Club mini-locket depicting some kind of tropical campsite infested with rabbits.
Also interesting to note is the doll variants. Lovely Kitty looks like an albino blow-up doll, but her twins are much better painted and resemble proper pigtailed girls molded in better plastic. I suspect these are the dolls that go with Betty’s Club, though, because ebay listings of complete Pretty Pixies sets show yet another variant of Kitty with red hair and navy blue outfit: derp-wise she appears to be a hybrid of the first two, with normal skin tone but badly drawn-on face.
Most interesting of all the dolls is the smaller, better-dressed, and non-articulated Kitty, of which two have already popped up on Polly facebook groups lately. Her base is the same shape as the others, which originally led me to believe she was none other than the titular Petite Princess. However, I recently discoverd that was not the case when I purchased a carded ‘Princess set with the same red-haired doll mentioned above. So the identity of this little gal is still a mystery. (EDIT: Mystery solved in this article.)
It does appear, however, that Petite Princess included makeup items to set her apart from her cousins. The size of the cards appears to vary drastically as well.
Further inspection reveals the cardback referring to the product as “Petite Miss”, making things even more confusing.

Betty’s Club also sports this odd anomaly. Even on the cards, all the sets are the same, so I’m not sure where this fifth set came from — clearly a redesign of the yacht races set that I have. It clearly says Betty’s Club on the outside of the compact.
EDIT 6/4/2019: It must be an early version, because a carded one just popped up with yet another toy line name, Claire’s Secret Locket. The doll for this set is very different as well: no pigtails, and no waist hinge, but clearly it’s what the pigtailed version is based on.