Chosen Solution

Friend wants a screen replacement on her moms 6s but no 3rd party sells 6s screens since it has force touch. SO is it possible for me to just buy the 6 screen to replace the 6s? or are components different/would not register because of different screens?

It’s not gonna work. Different parts. Different phones. There’s plenty of third party selling those parts iPhone 6s LCD and Digitizer - Original LCD

The screen and all the components on it (Home button, Front camera flex) are different so no chance of switching anything on the 6s out for 6 parts.