[yorwba]

https://newshound.co/editions/en-us/ is pretty good for seeing how many news articles published by different outlets are actually written by AP/Reuters/etc. and only modified slightly. I think the site was originally intended to allow users to choose the article from their preferred outlet, but I rarely find myself interested in reading any of the grouped articles.

[basch]

I like the same thing about https://techmeme.com/ if I click the arrow next to a story, it shows me everyone covering it, but they use editorial discretion to chose the "best" coverage, whether that be the first copy, or the first good copy.

[hieloz]

Similar website like https://www.zaqs.org/home.html, You can customize the news sources and track original content news websites.