Welcome to the Atlassian developer community @gergelyignacz,
No. The biggest change is that Confluence Cloud uses a different underlying format for content called Atlassian Document Format. And there are pending APIs being deprecated from v1 in favor of new v2 APIs that don’t exist in Confluence on-prem. From a quick scan of the source code for that Python lib, I don’t those difference reflected.
No. I’m not aware of any comprehensive resource for that.
Given the differences explained above, I don’t recommend trying. The abstractions are too far apart now over years of “drift” between DC & Cloud as different products.
Although written about a different Python library and about Jira Cloud, here’s my advice about using Python to talk to our Cloud REST APIs: