If i have a website that will share the same content for instance name.com = name2.com will that hurt the page ranks, serps or ANYTHING in either domains?
Let's see if I have this straight. The two domains will have duplicate content or as you wrote "share the same content"? If so, then yes they will both suffer.
Two sites having same content will result in duplicate content penalty. If one site is old and the new site will have the duplicate content, then most probably, the new site will get the penalty.