well, if those specs are off, then there is no way in telling, is there?
anyway, only a minority is running these large fans at the 12V they are supposed to be running at. so to continue... if there was some efficiency difference at full speed (eg different fans @ 12V, same cfm, unequal dba rating) i guess that difference would become very very very small once they are both running in the 5 - 7V range most of us are running those fans.
the easiest way i have been able to tax a fan is to look at the amperage rating
e.g for 120's
smaller than 0.4A rating : +/- low noise
larger than 0.4A rating : +/- delta style
the enermax 120's are +/- 0.3A
e.g for 80's
smaller than 0.15A: +/- low noise
....
e.g for 90's
smaller than 0.20A: +/- low noise
....
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