There are several L and R versions of morphs in the morphs++ packs. Not all of them have L and R equivalents but many do, beyond just the expressions - in the face as well as the body. Character vendors can't split the morphs on their own and package them with the character so that's something the end user has to do. Many posting in the various galleries just don't seem to bother with it. 

Anastasia is deliberately asymmetrical - her face at least, if not her body.