It's clear from the arguments among the Orcs, as they ran across Rohan with Merry and Pippin, that the orcs of Moria had no direct conection to either Saruman or Sauron. They didn't speak the same languages and had to talk to each other in Westron.
I think it likely that they ahd never been under Sauron's control, except perhaps for a while when Angmar existed, and then only through the Witch King.
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