This prompt defines the translation as a file for file, line for line port. Seems like historical knowledge will be fine.
It makes the git history a bit more confusing to follow if you want to see old changes, but I'm sure a simple wrapper to check for the zig equivalent files as well wouldn't be very difficult.
Having dabbled with both Zig and Rust, they do things so fundamentally differently, it isn’t possible to do exact lines like that.