Borderline personality disorder and Childhood-acquired Posttraumatic stress disorder are the same thing the only core difference is whether or not the resulting reactivity seems proportionate to the trauma from the clinicians perspective. This is more / less likely if the person has a more / less reactive underlying nervous system, but ultimately most of the judgment comes down to social perception of what’s a worse trauma vs what’s worse as a resulting negative behavior. If a “big” trauma makes you sad / withdrawn, you have PTSD vs if a “small” trauma makes you annoying / “difficult” you have borderline. (Am deffo borderline, personally. LOL)