It's VERY similar to SMX... not the same but so similar you probably can't tell the difference really. It might not measure out to the same level (audio or video) but from a humans subjective perspective it's probably the same.
Now I'm not familiar with your comment about the old vs. new SMX though. Not sure of the version that I have experience with but the seymore is so similar that if I ever redo my screen to 2.35 I'll go that route.
It is a very pronounced texture/weave though.. not very fine like a fabric.. more like heavy screen/window shading.... which is exactly what all this stuff is