To nitpick, none of these
was ever called Antares
To nitpick further, none of these was ever indicated to be a Bajoran ship; the bottom design was hired by Bajorans, but indicated to be owned by Petarians, with a human skipper. It did happen to have a dedication plaque saying "Antares
class", though. But off focus, and without dialogue to back it up.
Two designs have been referred to as Antares
class onscreen. One was a Corvallen freighter ("Face of the Enemy"; recycled footage from "Outrageous Okona" IIRC) that was space dust by the time our heroes got there; the identification may have been incorrect, then. The other was indeed a Bajoran triangle-ship ("Ensign Ro"), but whether it was an Antares
class vessel or a N'taaris
class one, we don't know, because this time there is no written evidence.