Jimdandy,
Lets just say that nightfighter Mosquitoes got far more He219s than He219s got Mosquitoes.
One problem with modeling the He219 is that the official performance is far better than the aircraft's actual performance. Officially the He219 could do 419mph, in practice it couldn't break 400mph, let alone reach 419mph. This could make modeling it accurately very difficult, not to mention highly contentious.
Mosquito NF.XXX had a top speed of 430mph, BTW.