Ok, so the HMS Unite (alternate of HMS Concorde) and Unite 1787 (alternate of Courageuse) represent the same ship at two different points in her career, correct?

As for Surprise, while I know that the Surprise of the A&M novels is a fictional ship, I was under the impression that it was based on the historical Surprise which seems to match it's description fairly well, but it's possible that the description in the Wikipedia article may have unintentionally been conflated with O'Brian's Surprise.

Anyway, thanks for giving me some Ares insight into this conundrum.