How are W. H. Auden's "Musée des Beaux Arts" and William Carlos Williams's "Landscape with the Fall of Icarus" similar?

You could argue that Auden’s poem contains some of the Imagist elements W.C.W. pioneered, but the essence of their similarities is really in the approach of each to the role of individual experience.

Bruegel’s painting really captures the essence quite well—the fall of Icarus was a matter of myth and legend, but such noteworthy events as that are largely irrelevant to the lives of most. Life goes on and our duties do not wait for us to marvel at such intrusions.

You can see—below the ship—the legs of Icarus sticking out of the water, yet the ploughman still toils.