Iow...ignore the common name. Pretty much useless. They're of the same genus so are closely related. Are they both Emperors? Well, Pandinus cavimanus is known as a "Red Claw". Does that make Emperors Red Claws? Or are the Red Claws Emperors? Answer is neither. They're all Pandinus. Common names can be misapplied and can be used to describe multiple species which is why the scientific names are preferred.