Can @PostConstruct be used as a substitute of @Bean/@Produces?

I was reading this post when I thought about the possibility of substituting any @Bean (Spring DI) or @Produces (CDI) with a simple @PostConstructor as in the following CDI example:

Replace:

public class MyClassFactory {

    @Produces
    @RequestScoped
    public MyClass createMyClass() {
        MyClass myClass = new MyClass();
        myClass.setA(1);
        return myClass;
    }
}

public class MyClass {

    private int a;

    private void setA(int a) {
        this.a = a;
    }
}

With:

public class MyClass {

    @PostConstruct
    public void init() {
        this.setA(1);
    }

    private int a;

    private void setA(int a) {
        this.a = a;
    }
}

Is that correct? What are the differences between those options?