It seems quite different actually. While this filter tries to completely change the sound of the whole recording, RTX voice isn't really improving the audio quality, but is rather focusing only on removing noise. I think it's a much more sound approach and doesn't really end up in actually changing language like in some of the examples below.
It's not usable for everyone though, I got a friend with a high pitched voice and RTX audio totally butchers it if she's not careful with how she speaks. And a giggle turns into a garbled mess and so on.
