Ayu CD Versions by region

[Calico]

^Probably. Plus they're considered different entities so they have different marketing strategies. Avex just probably has warehouses/factories in both places now.

You may want to see what the KR versions even have to offer. I think they come back while you were gone - for a long time Japanese CDs were banned (?) in Korea until an embargo was lifted and now they're being sold in Korea again with their own style. Sometimes they're even cheaper than HK versions and have other amenities.