I don't think so. It's about temperature and moisture; if you replicate those, the vessel doesn't tend to matter over much. As for tasting a difference between SV and braising, I don't see it much once you account for searing, but that tends to be a subjective matter.
As for cleaning stuff that soaks into clay pots: consider, kiln firing will get hotter than anything your oven can do; with care you could burn anything out that remains behind.