What documents are needed to convert from D4 to E2 visa?

I am planning to register for a Korean program, and when my current contract ends, I plan to change from an E2 visa to a D4 visa. After that, I want to go back to an E2 visa after 6 months, but I am curious about the process of changing from D4 to E2. I have experience changing from E2 to D10 and back to E2, but I lack experience with the D4 visa. In particular, I would like to know if new documents such as a Criminal Record Certificate (CRC) and graduation certificate will be needed when changing back to E2, or if the documents already submitted to the immigration office can be used again. Is there anyone who can share their experience or information related to this?