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There were 2 types of engines used by LW - Db601A and DB601Aa which had little different power output.
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There is certainly some changes from the early 1939 data.
I really don't think development was static in Germany for 18 months before the Battle the Britain.
Otherwise we would have to believe that Germany exported more powerful engines than they used in their own aircraft.
That does not make any sense and would be a first in the history of the world. 
We don't know the exact conditions, perhaps it is the performance with the automatik propeller?