这两种克隆Rust通道发送者的方法有什么不同？

use std::sync::mpsc::channel;

fn main() {
    let (tx, rx) = channel();

    // 克隆发送者
    let tx_clone = tx.clone();

    // 在不同的线程中发送消息
    std::thread::spawn(move || {
        tx.send("Message from thread 1").unwrap();
    });

    std::thread::spawn(move || {
        tx_clone.send("Message from thread 2").unwrap();
    });

    // 接收消息
    println!("Received: {}", rx.recv().unwrap());
    println!("Received: {}", rx.recv().unwrap());
}

use std::sync::{mpsc::channel, Arc, Mutex};

fn main() {
    let (tx, rx) = channel();
    let tx_arc = Arc::new(Mutex::new(tx));

    // 克隆发送者
    let tx_clone = Arc::clone(&tx_arc);

    std::thread::spawn(move || {
        tx_arc.lock().unwrap().send("Message from thread 1").unwrap();
    });

    std::thread::spawn(move || {
        tx_clone.lock().unwrap().send("Message from thread 2").unwrap();
    });

    // 接收消息
    println!("Received: {}", rx.recv().unwrap());
    println!("Received: {}", rx.recv().unwrap());
}