There is also possibly a difference in the story. Compare your box story to the story on the wiki for Baby Fifi. Baby Tic Tac Toe's story is different in the UK release, with terminology more fitting to the UK. Noughts and Crosses even makes an appearance.
I tried to buy the UK Tic Tac Toe baby MIB from Ebay but the seller flaked on me and I never received her. So unfortunately I don't have the example in my collection (sob). But that is something I noticed from the auction. The stories were different. So my tip is, check that with your box, too
I also have MIB Baby North Star from the US. I can't get to her right now though...so am not sure how her box is punched.