Following a five-year stint as executive producer/showrunner on USA’s Royal Pains, Michael Rauch is returning to the drama about two brothers arena with his new project as creator. CBS has bought an untitled drama written by Rauch, which centers on polar opposite identical twin brothers who duke it out in their personal lives but are at their best teaming up in the courtroom. Rauch is executive producing with Jennifer Lopez through her Nuyorican Productions, frequent…