The NT3 is definitely louder. Until you get the levels exactly equivalent (within 1dB or better) you can't really conclude anything about them other than one is recorded louder. It's a well established limitation of human hearing that in the presence of even tiny level (volume) differences, the louder one will automatically be perceived as better, more detailed, more accurate, more interesting, etc.
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Grabbed his jacket
Put on his walking shoes
Last seen, six feet under
Singing the I've Wasted My Whole Life Blues
---Warren Malone "Whole Life Blues"
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