Mix and match subs?

No, it does not work that way. One of the many things people realize when they get a DBA is how much extreme low end information there is even on recordings with zero low bass that can be heard as such. Similar to the way extreme ultrasonic high end cannot be heard as such, yet does create a greater sense of realism on all recordings, extending all the way down into the low bass region.

These simplistic views of sound and what we can hear are really, uh, simplistic.

I see no real value in having them match. Obviously. https://systems.audiogon.com/systems/8367 In fact, the main benefit of multiple subs is more small modes adds up to smoother bass. So to the extent they are different this creates even more variation in response, which for low bass is good. That is why mine were made 2 ported, 2 sealed, and they work beautifully together with the one ported isobaric Talon Roc sub. That is 5 subs of 3 different types. Just running out of new things to say about how misplaced an idea it is to talk about the importance of matching, integrating, timing, etc. There is a grain of truth to it. But it is so much less important than sheer numbers of subs as to pale in significance.