I'd be happy to!
The culture definitely overlaps some with HN, but the main difference I've noticed is that people on the Tildeverse rarely care how "useful" something is. I've seen some complaining about HN, especially with regards to something Tilde-related being posted to HN and then lambasted - I believe the specific example was Gemini.
So in short: Part of HN lines up, part doesn't. People in tilde's tend to be more driven by software lining up with their personal ethics than on HN, and they tend to dislike anything capital driven afaict.