What exactly is the difference?

I (male) was diagnosed with BPD as I fit maybe 7 or 8 of the 9 criteria for BPD. But my ex (female) was diagnosed with CPTSD and as far as I can tell we have pretty similar symptoms.

I guess the only difference is that she has had a traumatic past growing up (neglected by parents, blamed for some fucked up shit she didn't do, physically/emotionally abused by her sister, etc.)  while compared to that I don't have any traumatic experiences at least to that degree. For me it's more of countless minor incidents of abandonment and/or subtle abuse I think.

Her trauma explains the PTSD part in CPTSD, but don't a lot of people with BPD also have severe trauma and PTSD like symptoms? So what exactly is the difference?