A decent point, but each of those ships were from realities where the Cerritos is that class. Just as there are Klingons who never left Quo’nos or never evolved past proto-Klingons and those crews and ships were affected by the reality waves to reveal them.

I think there is a reality within which the Klingons evolved slightly differently and developed a slightly different culture, but remain close enough that we don’t see major changes to the events of the Prime timeline.