Yahoo search is own by Yahoo Inc (now Verizon) while Bing is from Microsoft, they're totally difference search engine.
Just do a search for the same keywords and compare results. https://search.yahoo.com/search;_yl...money&fr=yfp-t&fp=1&toggle=1&cop=mss&ei=UTF-8 http://www.bing.com/search?q=make+m...-10&sk=&cvid=1CCB79C3FC904F20A0943AB1F86853AA Can't see many similarities.
They use different search engines but you can see similar results. I see also ads from Yahoo Genimi on Bing.I think they have some partnership.
I found in my observation that most of the results are quite same in Yahoo and Bing search engines. So yeah, we can say they are exchanging the knowledge and algorithms it seems.