I would actually prefer different...because they are supposed to be different sizes...a fighter is at most a two person craft...while a PF can have a crew of 20-40... In SFB... a Fighter is represented by 8 to 20 hit/hull/damage boxes. A PF has its own mini SSD, and they have to do energy allocation...as fighter do not... Also I think that the shuttle should be different that the fighters as well, and maybe have a hydran flavor/shape...
Kana