What is the difference between Mary's Dormition and her Assumption?

My research has thus far turned up only one (seemingly small) detail: The Eastern Orthodox, Oriental Orthodox, and Eastern Catholic Churches believe that **Mary died a regular, albeit peaceful earthly death** and shortly thereafter her body was glorified and taken up into heaven. This is the Dormition of Mary; she died and was taken up. Roman Catholicism emphasizes that Mary was taken bodily into heaven **without definitively saying whether she died first** and Roman Catholics are free to believe either that she died or did not. This is the Assumption of Mary; she may or may not have died prior to being taken up. Both traditions are based upon extra biblical writings and tradition with no direct basis in Scripture, both traditions held to the Dormition view until late in the middle ages, and both still ultimately affirm that Mary was taken bodily into heaven. Is this really the only difference between the two; that the East insists that Mary died and that the West is unsure whether she died? What are the theological and (if any) practical implications of this difference?