There is a big difference.
Yahoo Japan uses Google and Yahoo.com in California uses Bing as their search engine.
Result is sometimes quite different.
ヤフー ジャパンの検索はグーグル、アメリカのグーグル本社の検索エンジンはBingです
検索結果はかなり違います
Differences -- Yahoo Search & Yahoo Japan Search
Yahoo Japan uses Google and Yahoo.com in California uses Bing as their search engine.
