You might think that, but no. The training is the same, as are the line training sectors. Traditionally the rotary find it no more difficult. As an aside, I found the Airbus easier to fly if you thought of the side stick as a Cyclic. It needs the same techniques as a helicopter rather than fixed wing to fly it smoothly.
p.s. Obviously the "rotary" chap will by the point he starts training with BA have his CPL (A) IR so will technically not be just rotary anymore.