I'm basing my analysis on tv adaptations, so my material may be a bit off.
In BXJ, Ah Jiu is a very sweet girl (BXJ 2007) yet in DOMD (84) her personality has taken a drastic change (from what i've seen so far. up to ep 28) She is a much more hardened character and I don't see any similarities between Ah Jiu and Jiunan. As possibly my favorite character in BXJ, it's very sad to see her personality change