Are life positions in transactional analysis accurate aides in diagnosing personality disorders?
Personality disorders are diagnosed with the DSM manual save for a few which have targeted assessment tools (like the PCL-R). 

TA is not considered a well supported technique research wise and lots of schools don't teach it except by way of a history lesson. I'm quite certain that both Berne and the authors of the DSM would agree that it doesn't actually map onto any specific personality disorders currently recognized. At best there would be a relationship between many of the addictions and related dependencies but they're certainly not seen the same way.