Here's a link to an article, from PC's archives, that discusses BP 1 & BP 2. It's a bit technical. But hopefully you can wade through it to find the information you're seeking:
The Two Types of Bipolar Disorder
And, then, here's a link to an article that asserts BP 2 is not simply a lesser form of BP 1 which people sometimes assume is the case:
Bipolar II is Not Diet Bipolar | Bipolar Laid Bare
Hope these articles are helpful...