There are not four distinct tellings of the death of Jesus, at best, there are 2, Mark and John,written many years apart, and at worst, only one. The gospels of Matthew and Luke use a very large percentage of the material in Mark, Matthew, some 90%, corrects a few mistakes that Mark made and expands the tale. Luke uses over 60 of Mark's writings, again, corrects some errors and expands it further, and both often use the exact wording of Mark, a clear indication that they simply copied Mark. The gospel of John was written much later that the synoptic gospels and many scholar see a lot of Gnosticism in it, and many scholars also believe that more than 1 person had a hand in writing it. The existence of the Quelle or Q documents often cited as an additional source for material in the gospels has now pretty much been discarded. Mark Goodacre, for example, in his book, The Case Against Q negates the need for anything like it.