What are the most common PMM KPIs, especially for mature/ large companies with established teams like content, lifecycle etc?

Even if you have other teams that "own" activities that are owned by PMM in smaller companies, your KPIs can probably still remain the same—they just become reflections of cross-functional efforts, and you'll need to ensure how you're calculating them matches how your DG, or content, or lifecycle teams are calculating. I've never run into a situation where a growth team, for example, takes issue with the fact that one of my KPIs matches or is directly supporting their KPI. I sometimes even call them out as "support KPIs" where it's clear I've grabbed a couple from their teams to ensure I'm helping support all parts of the business.

Your content team might have a KPI for content-influenced wins, for example. If you call that out as one of your "support KPIs" you could also note that your contributing activities will include giving the content team new research for a new persona, or updated messaging for a new launch, or support for building and analyzing an industry survey.