In some cases, yes, but there is a lot of it that has diverged in the years since. In the case of Go, while it originated in China, it really flourished in Japa

In some cases, yes, but there is a lot of it that has diverged in the years since. In the case of Go, while it originated in China, it really flourished in Japan and the Japanese developed it a lot further, up through the beginning of the 20th century. Throughout the 20th century, Go has gotten a lot bigger in China and Korea (where it is known as weiqi and baduk, respectively), and they are now generally favored in international matches, but before then, the Japanese were quite dominant. As far as other pieces of culture, yes, the roots of a lot of Japanese culture come from Chinese culture. But they have had thousands of years to become distinct; calling them just "re-packaged ancient Chinese wisdom" is pretty dismissive. It is good to recognize the roots, and sometimes the Japanese themselves are a bit xenophobic about that, not recognizing those things that developed from the Chinese, but dismissing their entire culture as re-packaged Chinese culture is equally rude.