from what I saw they need a RA between 30 and 60.I was under the impression that MLS gaskets required a specific surface finish to seal correctly.
I have ABSOLUTELY no idea how to go about verifying that. Worst case, they leak and I tear it all back down and put the 9333s back in. However you've inspired me to at least see what's on youtube about the subject. The counter argument there is Sloppy Mechanics.