Contradiction with Matthew 5:39
Deuteronomy 2:32 describes a battle initiated by Sihon against Israelites, while in Matthew, Jesus teaches to resist not evil and turn the other cheek.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Romans 12:18
Deuteronomy 2:32 involves a conflict, while this verse encourages living peaceably with all men, if possible.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with Proverbs 16:7
Where Deuteronomy speaks of conflict, this verse states that when a man's ways please the Lord, even his enemies will be at peace with him, contrasting with the battle context.
Proverbs 16:7: When a man's ways please the LORD, he maketh even his enemies to be at peace with him.
Contradiction with Luke 6:27
Deuteronomy 2:32 is about confrontation, while this passage calls for loving your enemies, opposing a battle approach.
Luke 6:27: But I say unto you which hear, Love your enemies, do good to them which hate you,