As I understand it, a pd is from birth, wiring awry from birth. Ptsd and cptsd are a psychiatric injury, not intrinsic to who we are.
My mother was finally diagnosed with a pd six years ago, in her 70s (and indeed sectioned because of how ill she had become). While I suspect she had experienced something traumatic in her childhood, there is a history of psychiatric illness in her family (I am adopted). With her,mit has been co-morbid with depression and anxiety.
As for narcisstic abuse: that is very much the story of my relationship with my mother.
I suspect anxiety is nearly always going to be a part of ptsd, due to the fear, terror, we have experienced.