Couldnt help myself

I think it would depend on the dominant disorder and how severe the traits where.
If each trait is on a 1-10 scale 5 being dissordered they could score 6 for all BPD traits but hit 10 for say 6 NPD traits. They do not have the full package in regards to NPD but it is more severe.
Out of the 36 ( I think) cluster b traits my ex wife scored 29 (I my unproffessional opinion). I could consider her NPD or HPD as she is probaly diagnosable for both but BPD seems to me to be the most prevelant.