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So i just did a battery replacement for my friend on his iPhone 6s PLUS and the flex cable on the top which i think is for the camera and something else, is teared (since the camera does not work and the earspeaker doeS not work either). i would like to know if i can replace it with a iPhone 6s part, as i have one from my broken phone?

It’s not a compatible part, they are both different

Do it has to be the iPhone 6s plus. The parts aren’t interchangeable. Sorry, but you can buy the replacement parts from ifixit and the parts will cost between 10 and 20 dollars