That is not a contradiction. The word "kill" is used in various ways in the OT and NT. It is a word with multiple uses, or shade of meaning, as to murder, is to kill. Allow the Bible to define itself, even line upon line. To do what you are now entering into, shows where your heart is towards God's word [whatever you believe it to be]. You seem to believe that there is no perfectly preserved words of God, anywhere, in a single book. It must then be easier for you to try to show erros in the words of Christ, than to admit this. Jesus is perfect, and preserved. Where then is His word? Who has it? Is it in our present time, our lost forever in history? Is it in a single place, or scattered to the four winds? Do we have it today, or are we still looking for it?
Jesus defines "kill" [Exodus 20:13; Deuteronomy 5:17, etc KJB] in Matthew 19:18:
Matthew 19:18 KJB - He saith unto him, Which? Jesus said, Thou shalt do no murder, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness,
However, the NIV, etc has real contradictions, 40, 42. They are not the same, in way way it attempted to be spun.