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Excellent question. It really depends on how you use each similarity. If you make it very obvious that your story has taken elements of the Harry Potter stories (-For example.) then it will be pick...
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Source: https://writers.stackexchange.com/a/14594 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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Excellent question. It really depends on how you use each similarity. If you make it very obvious that your story has taken elements of the Harry Potter stories (-For example.) then it will be picked up by fans who will start to pick out more and more similarities. However, if you use a few subtle similarities that allow the story to have the same sort of base of "Orphaned Hero finds amazing discovery and learns new skill to beat bad guy." It's not exactly a premise that is subject to just the one story and so you will more than likely get away with it.