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...