So here's the theory: DNA is shared by all organisms and is a bit different for every organism. All life shares the same set of genes, and genes in DNA are basically like letters, in which that they are arranged uniquely to make different sets of DNA, but never change themselves... Kind of like anagrams.
So Ralsei, according to science, might be a different organism or even a different species entirely
Also, how would Ralsei be Asriel IF he (Asriel) is at college? It's not possible to be at two places at once. In this case, the dark worlds and college.