Getting messy. I'll try to clear it up..
The comparison being made is between DPA MMA-A and Sonosax M2-D2, based off this post:
The MMA-A has been discontinued by DPA, but I don't know anything as compact and capable (at 24/96) to replace it.
Sonosax M2-D2?
"Comparable" is subjective. Both are highly capable,
relatively small devices compared to other gear, yet are not particularly close in size
relative to each other, and have quite different feature sets.
The M2-D2 is larger and is a more universal device that offers far more features.
The MMA-A is considerably smaller and more specialized. It is a dedicated preamp>ADC that provides 2-wire 5V mic power and a has a USB output. That's all it does.
The M2-D2 can do what MMA-A does.. and can also do a lot more. But it is larger AND more complicated.
Relative size and features are often significant factors with gear used for "stealth taping". What matters crucially to one taper may not matter much to another. Grawk is correct that the Diety PR-2 is a much closer comparable device to the MMA-A, both in size and capability. Primary difference is that PR-2 is a dedicated recorder which does not require a phone to operate.