Were they adopted by the Chinese and/or Koreans during or after the wars? Did it affect how they conducted warfare in any other ways?
This thread has a detailed answer from /u/hborrgg about land tactics: https://www.reddit.com/r/AskHistorians/comments/5mjnfe/weapons_and_tactics_used_in_the_imjin_war/
One of my earlier posts talks about Nobunaga's invention of volley fire. It may be of some help in answering your question, since the Imjin War was not that far off.
Do you mean by land, sea, or both?