Wow...no answers? I stumped the chumps!
Fortunately I ran across my own answer in this video:
https://www.youtube.com/watch?v=x8DxhS8wpoI][/url]
About the 44 minute mark one of the veterans mentions the fact that indeed one had to
re-qualify aboard every ship even if the ship was of the same class from the same shipyard.
Makes sense in hindsight I guess as no two ships were 100% identical.
.