Hi there. Usually newer resin formulations are the only ones available, see this post. Formlabs once (AFAIK) rolled back to an older version but that was because of an issue with the supply chain which prevented them to sell the newer version.
From formlabs official word, the V3 allows for finer detail to resolve than V2. That seems to be about it. I don’t think the mechanical properties have changed at least that’s the official word