I like that site too. I like how labels are only important as far as they help to determine the treatment...

But I do think there is a difference, even if the lists of symptoms appear similar, the importance of them in the course of the condition differs,
for example impulsivity: in BPD this is a major feature, they must show 2 distinct forms of impulsive behaviour, the forms are invariably destructive, while in BP impulsivity is mainly a part of manic episodes and can be benign, unwise or distructive...