That's not True.The analogy works because both are making assumptions about people without basing it on the actual character of the individuals.
There are British Japanese, American Japanese, hell there are Brazilian Japanese.
The culture and the norms will shape how people who are beholden to those cultures will react or interpret things. An American will stereotypically hold Freedom and Self Reliance above most things, and so forth. Likewise, can you say that an American and/or Capitalist based company will have a strict drive for making money above everything else. An American company will behave differently than a British Company, a Japanese Company, or a Brazilian company. It's not because the British Company will have a higher concentration of Genetic European People that the British Company will have different mores and procedures than the Brazilian company. Because there could still be a higher concentration of Genetic European People in an American company, but still act differently than both the British and the Brazilian companies. Even if they have the same number of Genetically European People in leadership.
You are making it about race by trying to state because I'm black, X. I didn't say because they were Japanese they are doing X. I'm talking about the Country's mores. Just like my Mores are not the same as an African person, even if our genotypes and phenotypes largely match up.
The Shared Racial Aspect will only tell how the people look, and even then there will be environmental differences like diet and geographical elements (both figuratively and literally) in play. There is no instinctual way a person from a Genetic Background will always act. Nor did anyone claim anything of the sort save for your analogy. In fact, you would have had more of a leg to stand on if you even said "American Black". Not that it would be necessarily true, but you would at least have had a focus which you could explain. You simply said Black. As Black American, Black Canadian, Black British, African Black, etc.
I spoke about a Japanese Country in Japan. A company made of up all American Japanese people from America, British Japanese people from Britain, or Brazilian Japanese from Brazil will behave difference due to their countries of origin's unique perspective and Mores which would have become apart of their own individual outlook since birth, and their time growing up in those different societies.