@steveb Same base files - the difference is in the aircraft's geometry, which Asobo state in their SDK is 'critical' to accurate behaviour. The geometry is accurate in both aircraft, the difference lies in how Asobo's core flight model interprets it. Unfortunately, had this been FSX we would have had plenty of controlling coefficients to make the required adjustments.
As this game is set up, we have to take the accurate geometry and trust that the core flight model gets it right. When it doesn't? Well, that question has remained unanswered on Asobo's "DevSupport" forum for about a year now, despite numerous bumps . . . .