When I worked for Sikorsky, the US Army had been doing a lot of modeling for air combat involving helicopters. According to their simulations (of which quite a few of the Sikorsky engineers were suspicious), helicopters would regularly defeat jet fighters, as helicopters can maneuver in ways that fixed-wing aircraft cannot.
The real issue, of course, is that a highly loaded, swept-wing fighter jet cannot try to turn with a relatively lightly loaded, straight-wing propeller aircraft. Doing so is fighting to the prop plane's strength. A P-51 pilot wouldn't try that with a Zero, nor a Spitfire pilot against a CR.42, because that's fighting to the Axis' aircraft strength.