Just found something interesting on a Bing SERP: they were not only showing individual images as usual, but were combining several images in one frame.
In the close-up image you can see current products as well as their predecessors. Meaning: these older images are not at all displayed on the website.
My guess is that the Bing algorithm groups images together, which have something in common - as long as they are to be found on that webserver.
