I personally don't really see the benefits of breaking down any diagnosis into smaller and smaller entities - when the treatment is much the same.
Couldn't agree more with that statement.
There are a lot of symptoms to PTSD, but I'm not convinced that some are more relevant to different trauma's than others.
Absolutely they are... and let me explain why and how using the two most prevalent.
Combat and Rape. A trained soldier is pre-taught anger, they are trained to instinctively act in an aggressive manner when threatened. Now remember that keyword, threatened. Think about the first two criterion for PTSD, and what do you see in them? Threatened is part of the entry for diagnosis, along with symptoms of anger which are on a severity scale, along with every other symptom.
Sex. Sex is something that is more an emotional act for female gender, than the physical act. So when raped, the core of the majority female gender have their entire emotional morals torn out from under them, because something they grow with and feel is a positive attribute, an enjoyment emotionally to them with the right partner, and so forth, all shattered. As a result due to the core positive emotional aspects correlating with sex, love making; dissociative symptoms are far more prevalent within sexually abused sufferers than a combat veteran, who is mentally trained the opposite, to not dissociate and instead act in rage to remove the threat.
Absolutely symptoms change based on the foundation of trauma itself. There are plenty of studies that also show all these aspects... just do a search on Google Scholar or such, complex PTSD, sexual abuse, etc, and begin picking through the studies performed that clearly show, undisputed, differences in reactions to stimuli due to specific traumatic occurrences.
Its like bringing in those who's trauma is only MVA based, nothing else. They won't have the anger or dissociation, they will have far more fear and isolation of going outside... just being near vehicles, being worst end of the spectrum.