They should as of 1.1.0 (to a degree, prior to this patch VOs for Aserai, Khuzait and Sturgia used place holders and thus shared the greetings). Greetings have also always varied a bit based on personality. This is also true for voices - I think in total there are ~36 voice variations (not all different actors) for generic characters.
RE OP - 1.1.0 introduced the volume control I mentioned earlier.