EPW sextics vs EPW cubes

We study a correspondence between double EPW cubes and double EPW sextics, two families of polarized hyper-K"ahler manifolds related to Gushel–Mukai fourfolds. We infer relations between these families in terms of Hodge structures and moduli spaces of elliptic curves. As an application, we prove that a very general double EPW cube is the moduli space of stable objects with respect to a suitable stability condition on the Kuznetsov component of its corresponding Gushel–Mukai fourfolds; this answers a problem posed by Perry, Pertusi and Zhao.