Generally the same idea, yes. Your parent mentioned a key difference though: "and pattern matching." enums in Rust have much stronger language support.
But there are also differences, for example, errors must be absl::StatusCode, whereas enums in Rust allow for arbitrary error payloads.
Also don't discount ecosystem usage: everyone uses Result in Rust, abeseil isn't used by most things, and std::expected has its own issues (though I can appreciate how tough making those calls is) and only landed in C++23, so it's not as widely used as Result either.
But there are also differences, for example, errors must be absl::StatusCode, whereas enums in Rust allow for arbitrary error payloads.
Also don't discount ecosystem usage: everyone uses Result in Rust, abeseil isn't used by most things, and std::expected has its own issues (though I can appreciate how tough making those calls is) and only landed in C++23, so it's not as widely used as Result either.