Chosen Solution
I need to change my s5 screen and I came up on one for 150 euros here on Ifixit. From the photos the back looks the same as the original provided by samsung. The price is high, but I am willing to spend if it is original, so are they? Or they are “replacements”?
Some iFixit parts are used, working parts, which are original, genuine Samsung parts. It’s likely that brand new ones are not, but they are some of the best quality available on the Net.