While I can't answer for Japanese/Western cultures, I can present the cases for Windows/OSX.
For some work I did for a large banking company a long time ago, I made a study into button positions. It's really difficult to find concrete sources for this but I came away with the notion that both parties expressed 'reading order' as a key value when ordering buttons. For Windows this meant putting the most desired/relevant action first in the list of things to read:
[+/Prev] [-/Next] [Do] [Don't Do/Reset] [Cancel/Close] [Pseudo-Do] [Info/Help]
This was compiled by looking at key forms and dialogue boxes within the Windows OS and noting the order that buttons appeared in. Not every form included all the buttons mentioned but the ordering of buttons that did appear maintained the relationships shown.
My study was specifically geared to users of the platform we were preparing - they were 98.5% Windows users so I didn't prepare a definitive button ordering for OSX. However, the scant research that I did do for this showed that OSX favoured a reading order with the most desired option/most relevant option last - presumably this was so that it would naturally form the terminal point of a Gutenberg Reading Gravity pattern... or so that the user wouldn't have to return to the beginning of the list after reading all the available options.
There is a possibility that designers in Japan use Windows more than OSX and are duly influenced by that but that would be difficult to prove conclusively.