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Unfortunately not in that way :)

To calibrate you need some absolute reference, making measurements with and without filters won't help if you use the same mic for both, the change in the measurement due to the filter will be the same whatever mic you use, but both measurements would still be only as accurate as the actual mic response. The main routes are to either have a calibrated reference source that is coupled directly to the end of the mic, so that any deviation from flat is due to the mic, or to make a measurement with a mic that has ben calibrated against a reference source then compare that with a measurement of the mic to be calibrated, and use the difference to create the cal file. This could be made easier in REW by providing an option to show/save the difference between two measurements, which is on my list of features to add.
 
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