Whats the difference between RAD and Boarder Line Personality Disorder?

Our 2 year old is RAD and her mother is BPD. I've always worried that the 2 year old will develop BPD because she already does so many things that follow BPD, and I know there is some evidence of hereditary link. We have a great therapist and have come a long way already. I feel better knowing that RAD and BPD look the same - I didn't know that before.