As i have seen the only difference is if you are an alien or not like in the imperial agent campaign i had a togruta and the other characters were messing with her as for human nothing like that happend. My question is if Sith Pureblood = Alien or not. Because it will be very strange to mock a sith pureblood as if he was a togruta. The thing that i love the most about the conversation is the gender mistake having a female character and then a slave saying "yes, sir"