Even if both countries have closely similar titles to their National Anthems, South Korea (ROK) derived their anthem from the old Korean Provisional Government anthem with the same lyrics which had the tune of Auld Lang Syne. On the other hand, North Korea (DPRK) composed an entirely new anthem while keeping the name "Aegukga/Aegukka". Both countries lay claim to the whole mainland. Several attempts had been made to reunify the entirety of Korea. Unfortunately, until today, both countries continue to have tensions.

South Korean Anthem - https://www.youtube.com/live/0Sf-i80d...

North Korean Anthem -    • 北朝鮮 「朝鮮民主主義人民共和国創建75周年慶祝民防衛武力閲兵式 (조선민...  

DISCLAIMER
This video is only intended for educational purposes, no copyright infringement intended.