The P-40 could out turn the Macchi 202 and 205s but not the lighter 200s. I'm not making a power measurement, just simply looking at wing loading although sustained performance at altitude (20k ft +) probably went to the Macchi.
Macchi 205s had similar wing loading as a moderately loaded P-47 if that gives you any indication.
The Macchi was a faster plane in level flight and had much better climb characteristics. In the time it takes a P-40 to reach 6000m the Macchi could climb to 8000m. So the high altitude fight would be best avoided in a P-40, where the low altitude fight would be best avoided in the Macchi.
In comparisons at medium altitudes, the 205s probably shared similar zoom performance as the late P-40s (K-N) but roll performance and turn would've underperformed by comparison. The 202s were not far off, but the P-40 would still own it in turns by a small margin.
The reason i go with the P-40 is the armament of 6 50 calibers over a couple bredas. The 205 had more firepower but was probably better suited for attacking bombers from the looks of things. It simply was not as maneuverable, although faster, as the 202s.
Bill