Catherine is beautiful, superficial, and capable of sweetness , but is equally capable of volatile mood swings. Catherine is very aware of social status, and in this way never lets her heart truly rule her actions.
Cathy is beautiful as well, yet she does not have the emotional extremes that her mother does. This is not to say that she is emotionless, she does possess a strong spirit. The main difference is Cathy was able to love unconditionally, she would plans to leave with her true love, without caring what others might think.