the ultra-advanced mirror universe tech is Disco's programmable matter under any other name.
I'm pretty sure Dave introduced that tech in his MU novels long before
Discovery came along. If not, the catoms in Dave's
Destiny trilogy beat
Discovery to the punch by quite a few years. What DSC calls "programmable matter" is really more like catom-style nanotech. The original use of the term, long before DSC adopted it, referred more to a material whose electron shells' quantum states could be modified to allow it to mimic the optical, thermal, conductive, tactile, and other properties of any desired element or compound, even ones not found in nature. So that, for instance, a wall could be reprogrammed to be a window or a mirror or a light source, or have its color or texture altered at will. Or a surface could be programmed to feel and behave like metal, glass, stone, rubber, or whatever.
Although I guess DSC's programmable matter is not unlike the advanced version that Wil McCarthy called "wellstone" in his novel series
The Queendom of Sol. Wellstone could not only transform itself into any substance, but could replicate anything on a molecular level, and was used for a form of teleportation in which people were broken down by one slab of wellstone and reassembled by another, often with the wellstone editing their molecular patterns to cure illness or injury, prevent aging, or modify their bodies as desired.