Pirian/meta
Game-stats-wise, Pirians are humans who can have C6 Charisma instead of C6 Social Standing (with the usual halving of Social Standing when emulated from Charisma if they do).
If you are in a game where the difference matters, Pirians generate their Charisma exactly the same way Vargr do, and change it over time the same way (including infighting - though they have only known it by that name since coming into contact with Vargr, and on average infight less than Vargr). It was essentially the same Charisma even before they made contact; centuries of cohabitation have eliminated any minor differences that may have existed.
Even if you are not in a game where the difference matters, Pirians tend not to take the Noble career, as there is no nobility in the Pirian Domain (and not much outside the Domain) for that career to reflect (unless you are using one of the versions of Traveller where the Noble career reflects general high government service).