I'm a little confused about the HMS Concorde 1783/HMS Unite 1796 (SGN101A) ship pack.

Near as I can tell, the HMS Unite 1796 should actually be the HMS Surprise. Granted, the ship was originally named Unite but was renamed Surprise after her capture.
I can't understand why Ares would label her as HMS Unite when there's already the Unite' (alternate of Courageuse) that comes with the base set.
What extra confuses me, is why they wouldn't call her Surprise given the number of Aubrey & Maturin fans that play this game.

Or am I completely wrong? I'm a little biased, as I'm currently reading book 20 of the A&M series.