Actually, the point of divergence between the two universes is in the 19th century. So what that means is, there are two very different
universes where the Narada
did its dirty deed: one that is an extension of the main Sigils
universe, and one that is an extension of the SigCat
universe. (The Narada
interfered with the timeline in the 23rd century, not the 19th.)
If you go over to Ad Astra, and read "Cardassian Sunrise," that's the Sigils
-universe version, and it's VERY different from this one.