NoScript is also integrated into https://play.google.com/store/apps/details?id=com.brave.brow... This uses Chrome so there's likely higher compatibility with mobile sites

script blocking may be built in but I don't think noscript is.

Other than name/logo what's the difference? Brave allows you to block all scripts by default and only whitelist specific sites.

Noscript does more than just turn javascript on and off. I recall the creator of noscript writing a post a few years ago saying that the plugin model of chrome didn't allow for all the things noscript does. That may have changed since and umatrix may be able to do things that the noscript guy said couldn't be done but I don't know

Brave's features are not an extension. It's is a fork of Chromium. Any mechanism they include in their build has none of the limitations extensions have and they're not extensions at all.