One major difference between the Fourth Gospel and the Gospels of Matthew and Luke; is that the Fourth Gospel account is one of Jesus finishing his job after his resurrection and ascension.
We are told that Jesus has completed his work. Nothing more needs to be done - except for each person to choose whether or not to follow Jesus.
Whereas Matthew and Luke, with their assertion of a second coming, assert that the ascended Jesus had done only half the job.
The job would be finished only with the second coming of Christ.
Furthermore, the Acts of the Apostles (continuing Luke), and Paul's Epistles also assert that the efforts of Men - by teaching and organising, are needed in order to complete the work of Jesus.
By my understanding, both cannot be correct.
(Note: I believe that the Fourth Gospel is the correct teaching.)