Japan and South Korea are frequently grouped together in geopolitical, economic, and environmental contexts, such as their shared status as U.S. allies conducting joint military exercises [1], [2], [3], [4] and their coordinated imposition of sanctions on Russia [5], [6], [7], [8]. They are also frequently analyzed together in studies regarding energy policy, solar land use requirements, and decarbonization pathways [9], [10], [11], [12], [13], [14], [15], [16], [17], [18]. Furthermore, both nations are major East Asian economies often cited together in trade agreements, industrial policy comparisons, and supply chain discussions [19], [20], [21], [22], [23], [24], [25], [26], [27].