Besides the fact that both of these papers show 109s with the 990 PS DB 601A and not 1045 PS 601Aa....
And, despite the weaker engine operating at an unknown power, the first test (476 kph) still just satisfies the guaranteed specs of Messerschmitt (500 kph +/- 5%, that is: anything between 475 and 525 kph is O.K.).
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