Most mod authors require permission before putting their mod in a public modpack. What I want to know is what counts as public? What if I had a whitelisted server running the modpack but it wasn't for public download? Would that still count as public?
If you got permission from both (I dont know what there stance of mod pack usage is) then you can have both. You just need to know what there specific stance on mod pack usage is. To your other question as long as the mod pack you are making is not for public download then it is private.
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Feel free to check out my channel!
My current setup:
http://pcpartpicker.com/p/Q7wqf7