According to rather old FM files there is a DB601A and DB601Aa. The Bf 109 uses the DB601A, only the He-111 P uses the DB601Aa.
Both engines have the same FTH (4500m), max boost (1.35) and WEB (1.45) values. The difference that I found:
- DB601Aa has a higher ramming factor
- DB601Aa has a constant speed propeller
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