What is the difference between Apollinarianism and Eutychianism?

Both Apollinaris and Eutychius believed in one divine subject Christology that the only and whole person of Christ is a divine person, the Logos. Not a divine-humane person. Their Christology were condemned at Constantinople (381) and Chalcedon (451), respectively. Apollinaris teaches that the Logos supplant the rational faculty of Christ not another man. While Eutychius teaches that the flesh of Christ belongs to the Logos and not another man. So that both teach the Logos, a divine person is the only divine subject. How then one in principle manner differentiate their Christology from one another?