So the between-mic results are close, but between-calibration results are not. It's frustrating that mic calibration is so variable. A third independent calibration might give a hit of what's going on (not that I'm suggesting you find one).Here is a measurement comparing the two mics. Not much difference above 20Hz, and below 20Hx I don't care.
I owned a TacT 2.2X DSP preamp almost 20 years ago, which came with a mic and cal file. At my request, TacT recalibrated the mic and sent a new cal file. Then, I bought a third-party mic with its own calibration file. The TacT's automated DSP software gave quite different-sounding results across the three possibilities. I picked the one that sounded flattest and most natural to me when I played back acoustic piano runs and such. Today, I tweak bass by ear, 1/8 of a dB at a time, on my Anthem preamp, whose proprietary mic comes with an encoded calibration file that will frustrate any user who wants to know what really is going on. So not much has changed! The scientist in me is a bit perturbed by all that, though it's usually easy enough to put out of my mind and enjoy the music.