I've heard that moving saves between regions is possible, but I've never tried it. it may not work for all games either. it sounds like it's a bit like how it works with the wii where on the wii, you decompress the save to where you have savedata and a banner, and you move the savedata over to another region's save, replace it, then rebuild. you don't move the banner (i.e. sce_sys in the ps4's case). the sce_sys contains a param.sfo which contains account id, and most likely the region as well, so the savedata outside of that folder is just raw data or seems to be.