You can find the canonical name of your installed "Google Pay" if you click on "Share" in the app view of Google Play.
I live in Europe and had the same reaction as you, and I have com.google.android.apps.walletnfcrel installed, which shows up as the mentioned (old app) in the US Play store[1]. So I guess, as usual with Google: Maybe we're affected?
New new one [1] says "This app is not available for your device" so it seems it can be anything from "we're not affected" to "we're affected much more than US". :-/
I live in Europe and had the same reaction as you, and I have com.google.android.apps.walletnfcrel installed, which shows up as the mentioned (old app) in the US Play store[1]. So I guess, as usual with Google: Maybe we're affected?
[1]: https://play.google.com/store/apps/details?id=com.google.and...