Basicwiz, some MAT poses are partial;  they only change some of the material zones.  To make the corresponding selective mc6, click the + to save and specify a subset of whatever material zones are relevant.

For example, a MAT pose entitled makeup A might only include skinface and lips.  You could set a doll to bare shaders (I keep an mc6 just for wiping everything to simple shaders) and then apply the MAT pose to find which material zones are affected.  Or, if you're comfortable with a file editor utility, you could study the MAT pose in that.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5