The title is wrong as they are not just different in sourcing but topic.

A better title would be "Hacker News but for general content from independent blogs."

Hacker News but for independent blogs would be the same topic as HN but only stuff from independent blogs.

This is avowedly broad: "Hacker News and Lobste.rs have community voting figured out, but non-tech content gets drowned by the tech majority"

https://bubbles.town/about