The berries on the right are from Aronia melanocarpa “Moskva”. The berries on the left I’m using for the first time this year seed propagated as Aronia x prunifolia, which is a hybrid called purple chokeberry in recognition of its purple berries (although Moskva have more purplish berries in this picture!). It is considered to be a natural hybrid between Aronia melanocarpa and Aronia arbutifolia.