A search in Bing for "cult of the dead cow" seems to give me some localized (Japan) results, while DDG has a bunch of American Beto O'Rourke politics news pieces added.
The Bing API provides a different set than Bing itself. Compare "cult of the dead cow" on Ecosia Japan (which is a straight-up Bing API proxy) with DDG Japan and you will see that the results are identical.