movie runtimes / edits / cuts / censorship comparison?

as many of you will be aware, there are oftentimes different edits of horror movies, with different runtimes, or even different scenes.

a lot of movies are legally available on YouTube, but many of these are not age-restricted, lacking scenes, and/or are blurred in parts.

so checking version and runtime is more or less mandatory.

can you point me to some sources with version comparisons, listing runtimes of different edits, censorship cuts, etc.?