Long form posts (wordpress.com article)

I was made aware of an article which was published on/for wordpress.com titled "Longform posts".

The full title of yhe article is: "Digging In the Dashboard, Part II: Features for Longform Posts"

Do you know if Longform posts and breaking them up in sections, while creating and index is the same in Wordpress.org as in Wordpress.com?

Same type of question is for breaking long posts in pages with page breaks. Are wordpress.org and wordpress.com compatible here?

Tx Erik Wust