We know of considerable copying in the Synoptic Gospels (usually held to be material copied from Mark in Matthew and Luke, and material from another, lost, source copied into both Matthew and Luke, although other scenarios are possible).
Any consideration of the differences between the Gospels needs to take this into account. The superficial approach if labelling the differences "minor" and simply asserting that they are evidence of accuracy is hopelessly inadequate, and ignores the reality of the texts.