To answer your question specifically: Although there are few public records documenting their lives, Christopher Marlowe and William Shakespeare were undoubtedly two different people. Marlowe was stabbed to death in May 1593, while Shakespeare ls known to have lived until 1616. Speculation will always live on concerning whether Marlowe (or someone else) wrote some or all of Shakespeare's plays and verse. However, it does appear that most of Shakespeare's accredited work was written after Marlowe's death.
I think it’s interesting like the many conspiracy theories floating around out there. There is also a theory-- based upon word counts in some biblical books, with regard to the number of words, where they’re located, what words are used--that Shakespeare wrote part of the Bible.
There is still the question of Marlowe's death. the medical report stated that he was stabbed in the eye which will not have killed him. could someone else been substituted for him and he went on a secret mission elsewhere? he was a spy for Elizabeth. there have been a number of books written about Marlowe but none of them seem to agree. can anyone recommend an authortive book about him? does anyone know if the Marolowe Society here in the USA is still active? have a nice day!