They are not same. They never have been the same.
Isaiah (14:12) Lucifer, son of the morning
This is the only verse in the bible that mentions Lucifer. Although most Christians consider Lucifer to be Satan (the devil), there is little biblical justification for doing so. In this verse "Lucifer" refers to the king of Babylon (Nebuchadrezzar?) and Lucifer (the light bearer) is also called the "son of the morning" or morning star. The only other person that is referred to in that way is Jesus (Rev.22:16). Does this mean that Lucifer is Jesus?
from Skeptic Annotated Bible