THIS MIGHT SURPRISE YOU
The answer
Matthew 6:9-13 and Luke 11:2-4. Matthew's is longer; Luke's is shorter in modern critical editions, though later manuscripts expand Luke toward Matthew, so the two look much more alike in a King James Bible. Neither appears in Mark or John.
Why it’s interesting
The "debts" vs. "trespasses" split churches say aloud starts here: Matthew 6:12 has "debts" (opheilemata), while "trespasses" entered English through Tyndale and the Book of Common Prayer, drawing on the wording of Matthew 6:14-15. And the familiar closing — "for thine is the kingdom, and the power, and the glory" — is absent from the earliest manuscripts of Matthew altogether.
Scholarly consensus
You can know the Bible.
Not just the stories, but the history, authorship, and scholarship behind it.