The big difference between Japanese Yellow and non-Japanese Yellow is that non-Japanese Yellow plays in color on the Game Boy Color. - English Green. This is not an official game, but a ROM hack of English Blue. The guy who made the hack basically swapped out the graphics and made some other changes, such as to recreate Japanese Green in English.

The word that originally meant "yellow" was きいろ meaning 木色: color of wood, then it's assigned with 黄色. In other words, きいろ existed before 黄 in Japanese.

Yellow derives its name from the Japanese word ‘Kiiro,’ meaning “yellow,” which is a combination of two kanjis: ‘ki,’ meaning brightness or lightness and ‘ro’ representing shininess or luster. Symbolically, this color signifies courage, prosperity, wealth, good luck and represented Buddhism’s enlightenment phase.

Japanese Sweet Potatoes vs. Sweet Potatoes . In addition to differences in flavor and texture, Japanese sweet potatoes have reddish-purple skin and pale yellow flesh. This differs from common varieties like Beauregard, Jewel, and Garnet, which have orange skin and orange flesh.

Yellow (黄色 (きいろ)), one of the three primary colors of light, is abundantly found in nature—sunlight, flowers, and fruits. In Japan, yellow symbolizes brightness, hope, and happiness and has been used in clothing, family crests, and paintings.