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I’m repairing a phone and I was wondering if I took 6s screws from a parts phone and put them into a 6 plus. Would it work? I know that 6 and 6 plus can go together and 6s and 6s plus can go together, but are they all essentially the same screws?

Yes, They are Compatible,You May want to replace them though with the Philips Screws

Hi I would look at these two repair pages to check it out The steps should have the measurements on them iPhone 6s Repair iPhone 6s Plus Repair Hopefully this helps Any questions please ask Thanks:-)