Ayu CD Versions by region

[mimika]

I am confused - I thought in the past there is only Japan version and Overseas version. 2 verions only. Japan version is made in Japan and targeted to Japanese market. Overseas version is made overseas and it is targeted at the rest of the world outside of Japan. Although the overseas version means Chinese version because it has Chinese titles on the album and Chinese lyrics translation. If you look at the overseas version CD, usually at the back, there is a disclaimer saying this is for sale in HK, China, Taiwan, Singapore, Thailand, Philippines etc etc

However, it seems like when A COMPLETE is released, there is HK version, TW version..etc etc....

So is there no overseas version now? Overseas version has changed in HK version and Taiwan version? What's the difference?

Please help me as I am deciding which version I should buy for my A COMPLETE!