I personally don't see product marketing to be of different types. However, as you setup a product marketing function you need to develop work streams that are led by experts.
These foundational work streams can include:
- Developing GTM messaging
- Coming up with pricing methodology
- Developing sales playbooks
- Managing product launches
- Churning out content with a regular cadence
- Developing competitive outtakes
- Managing relationships with industry analysts
I don't see one person being an expert at all of this. As a product marketer, you need to align yourself with certain foundational components of product marketing and try to become an expert in it.