Casting references VS Casting the mem address of that reference?

[babaliaris]

If you want to cast a reference you usually do this:

Subclass &myref = (Subclass&)base_class_object_ref;

But I have also seen people doing this:

Subclass &myref = *(Subclass*)&base_class_object_ref;

I understand how it works, but is there any difference? Is there a reason or a specific scenario where I must choose the one over the other?

Thanks