They are the same thing I guess. Pocket nappies require a booster/insert - they usually come with the nappy. You can buy boosters seperately and add them for more absorbency to any nappy. They are usually a seperate piece (pocket nappy), or stitched in (AIO). Have you thought that AIOs can take a couple of days to dry? Most of my stash is pocket for this reason. Although Pikapu are quick drying because the booster flips out to dry. Bambooty also do an easy-dry style that is similar.