If you look closely, you can see that the Tsing-Nasu (below) is an improved version of the Tsing-Yoichi (right). This improvement is attributed to an evolution in design by the minifig designers, but it can also be ascribed to the builder himself. The Yoichi was his first attempt, and the Nasu is his attempt to improve on that first design.
I respect when a builder takes the time to revise a creation, and try to improve it, even if the original was quite good to being with.