Both of these texts are very similar in the way that they ask serious questions about what it means to be human through profoundly muddying the waters in the creation of creatures who are not human yet at the same time show many characteristics of being human. In both texts, the replicants and the creature are made by humans. The texts explore different facets of human experience constantly causing us to question how we are differentiated from other forms of life. In a sense, the creature and the replicants seem to be difficult to separate from humans. Both are able to have emotions and to feel longings and passions within them. Both are able to love and are shown to need the warmth of human companionship. Both are shown to be able to dream and to have desires.
In addition, it is possible to argue that the replicants and the creature are shown to be more "human" than the actual humans that they interact with. Let us not forget the cruel and chilling way in which Josephine was condemned to death in Frankenstein, and the way that the replicants are hunted down one by one and cruelly slaughtered in cold blood by Blade Runner's such as Dekkard. Such texts then serve to seriously question our ideas about humanity and what makes us human, suggesting, perhaps, that we may not be that "human" after all.