From what I've seen the Apple apps all have the same radius but 3rd party apps are largely yet to update. Same thing happened when they changed the stoplight window buttons and some 3rd party apps still had the glossy ones years later.

there is a difference between apps that have toolbar of any kind and the ones that don't and then there's inspector window (the one that shows file properties), again, different close button size and different radius. Three types, just in the OS alone

compare: Safari, Finder settings, "Get Info" in finder