Yes, multiple microphones is how microphones can be calibrated in the first place. You make a particular kind of microphone that also functions as a speaker, with certain testable assumptions about how they work. Then you point one at the other and vice versa. The result is a reference microphone that can then be used to calibrate other microphones.

You don't do it every day, which is why an outfit like Bruel & Kjaer can charge a lot for their gear. ;-)