Native apps can benefit from using shared libraries, which can be updated in such case. Using WKWebView ensures that vulnerabilities are patched as part of OS updates.

On OSes with sane package managers (e.g. Linux distributions) native apps can share all dependencies, so there is no need to recompile/redistribute each application using affected library.

Sadly, there is no such thing on MacOS (excluding brew/port) and Windows (or even iOS/Android), and even native Linux applications are moving towards bundling all dependencies in a single package.

Typically a native application will depend on shared libraries (or runtime such as jvm, .net) which can be updated independently of the application itself. That said, if the vulnerability is in the application code, you are correct, there would be little difference.