Why do Pastors Mark Driscoll and Perry Noble have such similar sermons?

I have watched almost all of Driscoll's sermons online and I recently found Pastor Perry Noble's New Spring Church online: http://newspring.cc I am making some striking links between many of their respective sermons. Many times stories are re-used (ironically in the first person), and general concepts and... show more I have watched almost all of Driscoll's sermons online and I recently found Pastor Perry Noble's New Spring Church online: http://newspring.cc I am making some striking links between many of their respective sermons. Many times stories are re-used (ironically in the first person), and general concepts and even the comical delivery is in sync. What is this? Do they collaborate and agree to share material? If so, is it okay to lie to their churches about something that may or may not have happened to them, if it is for effect? Though I love Mark, this feels wrong and kinda sickening. If anyone's very familiar with either one of their online sermons, please try to explore the other's and give me some feedback or comments. Thanks
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