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.