The P51 and FW190 are fairly evenly matched when in good hands... which comes to the point - all pilots being the same, it's the plane that makes the difference.
I had a low, slow and twisting online DF with a P51B (or C), which went on for a minute or so. We were both taking pot shots, but he never really hurt me, but a few glancing shots of 4 cannons and 2 mg's were taking it's toll.
He eventually lost control and ... bought the farm.