Level differences do, in fact, matter, they influence your capability of hitting a mob, 4 to 5 levels higher is not a valid range as that is JUST turning red, this also influences experience in some cases, once a mob turns grey you no longer receive experience, and if you do it's in a very minute quantity. I hope I helped some. Also, you can look around in the GitHub to possibly find code that verifies or disproves my statements, it's always the best guess.
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