Contradiction with Mark 6:16
This verse explicitly states that Herod himself says John, whom he beheaded, has been raised from the dead, which aligns with Matthew 14:2, rather than contradicts it.
Mark 6:16: But when Herod heard [thereof], he said, It is John, whom I beheaded: he is risen from the dead.
Contradiction with Luke 9:9
King Herod expresses uncertainty about who Jesus is, wondering if John has been raised, instead of being convinced, unlike the certainty suggested in Matthew 14:2.
Luke 9:9: And Herod said, John have I beheaded: but who is this, of whom I hear such things? And he desired to see him.
Contradiction with John 1:21
This verse demonstrates John's denials about being the Christ, Elijah, or 'that prophet,' distinguishing himself from the roles attributed to him, contrasting the belief that he could be resurrected as in Matthew 14:2.
John 1:21: And they asked him, What then? Art thou Elias? And he saith, I am not. Art thou that prophet? And he answered, No. [that prophet: or, a prophet?]