As learned in the Biblical and Buddhist Parable lesson, Zen parables are used as a tool to to live a better life.
One of the parables taught against lust (even when not directly touching a woman), while the other taught forgiveness, and learning to live a better life
The end goal of Buddhists is to become enlightened, and these skills help to become enlightened.
Zen parables were shorter, and used much more direct language. This could be directly from the fact, Buddhists strive to live a more simple and basic life, to eliminate suffering
The Christian parable was a bit more difficult to understand. The bible was written in a time period, where only scholars could read and write, which would explain the thoroughness and more obscure words.