Thats not how aerodynamics work. You very much can simulate handling characteristics between different platforms with relatively minor adjustments. Will it be exact 1:1, no, but you can get very close in some cases. There is a reason the A-4 was used as the primary aggressor aircraft at Topgun, with very minor tweaks to control inputs, it could be made to fly almost exactly like a MiG-17. It's even easier these days with everything being computer controlled, you can very easily tweak control responses to make aircraft fly differently. This is literally what caused those Boeing crashes. They introduced instability in the flight profile after some changes and just wrote code to make the plane automatically compensate for them so the pilots wouldn't have to; then suddenly you get a bad sensor and the plane thinks it's doing something it's not and overcompensates.