Using a UK 360 in Japan?

[Asura]

Okay, so I've got:

- A British Premium 360
- A Japanese Elite 360

If I can't use the PSU from my Japanese 360 for my British 360 then what can I use? A Japanese Premium / Core 360's PSU?

You may need a step-up transformer. If you go to Akiba you should find one amongst the smaller electronics dealers (prepare to feel like Alice tumbling down the rabbit hole though, when walking through those 3-foot wide streets).