I had a feeling it looked just similar enough to be deceiving.

I think there’s a few places where this is true in Rust especially. For example, coming from a C-style language (and Python) the enum keyword throws a lot of people off. In Rust, while you can use an enum to represent a set of “constant” values, it’s more common to use it to represent a tagged union, making it more like type from F#:

// a union:
enum Response {
    Html(String),
    Text(String),
    Json(serde_json::Value),
}

// or a more C-style enum:
#[repr(u16)]
enum StatusCode {
    BadRequest = 400,
    NotFound = 404,
    // ...
}

You might find that some concepts look and feel similar to what you might see in traditional OOP languages, but often end up working more like something out of a functional language.