... Back to real history..
In brief, the lineage of Macchi's was
MC 202 'Folgore'
Improved Mc200 frame with DB601 engine
MC205 V 'Veltro'
Stopgap solution: Mc202 frame fitted with DB605 engine. After a few produced with only 2x12.7 on cowling and 2x7.7 in the wings, the wing was modified to accomodate 2xMG151/20. (officially the MG were standardized on the Series III that was delivered in June 43, but many units of the series I were already carrying the 20mm cannons)
Production was about 180 aircraft before the armistice, plus another 100 in the Salò republic under German control.
Several MC202 that needed an engine change were refitted with DB605 in 1943-44, they were known with the nickname 'Folgeltro', adding confusion to confusion. This machines retained the 202 armament of 2x12.7
The structural difference between Mc200, 202 and 205V was really small, no more than the differences between Spit I - V- IX or 109E-F-G, so it was basically an evolution of the base Mc200 design.
Was common practice to repair the 205 cannibalizing spares from older 200 and 202 frames
MC205N 'Orione'
This was Castoldi's definitive design for the DB605 engine, redesigned with a larger wingspan (wing area 19sqm instead of 16,8).
It should have addressed the drop in maneuvrability of the 205V above 8500 mt
Also featuring an additional MG151/20 firing trough the hub, 109 like.
The difference between N1 and N2 was only the armament : the N1 had an engine mounted MG151, 2x12.7 in the cowling and 2x12.7 in the wing bays, the N2 replaced the 12.7 with the MG151 in the wings.
Only 2 prototypes completed
MC206
Interim design for a new 'high ceiling' fighter: was basically an enlarged MC205N airframe fitted with DB605 and redesigned wings, wing area was 21sqm and armament was 4xMG151 in the wings (Typhoon like)
No completed aircraft known, doubtful if a prototype was partially built.
MC207
The final design: MC206 airframe with DB603 engine
Only design.