Pretty sure Chinese Yam was Nagaimo (Huai Shan or Shan Yao in Chinese) while Yamaimo was literally mountain yam (or wild yam). 🤔
Though the texture is similar, apparently Yamaimo has darker skin than Nagaimo, though in some regions of Japan, people don’t differentiate the two.
I love it sliced into rounds and sautéed with a bit of soy sauce. Tororo on the other hand, depends on my appetite of the day.