You mean Black Gold?
It's suppose to be a " renovated " model...
Yes, that one.
In the absence of other information, it is indeed likely that the "II" part has something to do with the ship being "recently renovated", as in somehow upgraded. If it was meant to be a new class it didn't get entered into the MUL yet.
MWDA liked to sneak in stuff like that. There's also a
Magellan MkII JumpShip mentioned in a single image caption. TPTB (Ray) ruled that one as not being a proper class of its own, so implicitly a variant. I guess the same applies here.