Could I take a Core i7 form a 2012 MBP and put it into a 2018 MBP?

I know very little about computer hardware so I thought I might as well ask. I have an Intel Core i7 in my MacBook Pro Late 2012. I am considering getting a 2018 MacBook Pro. I was wondering if it is possible to purchase an Intel Core i5 2018 model and then just take the 2012 Core i7 and put it in the 2018. I am wondering if this is realistically possible and also if its technically possible (like could the 2018 hardware accept a 2012 core i7 or would there be other hardware compatibility issues). I am also wondering how a 2012 Core i7 processor compares to a 2018 Core i5 (would it be worth it).