In-game the differences between the I-300 prototype and the MiG-9FS so far as I can tell is in the armament only. The MiG-9 has a N-37 and two NS-23 while the prototype had the larger N-57 cannon and two NS-23s.
It seems that in real life the issues with the cannon causing the engine to stall persisted but in-game only the prototype suffers.
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