Can't help with whether or not the DRM in your Japanese 350 will be any different (normally you'd just register the new ereader to the same Adobe ID that you linked the Sony 350 too and the books would then be readable on both - you can register up to six devices I think). However, if you already use Calibre, I'd suggest if you've not already done so to consider getting help from Apprentice Alf and try out the tools for DRM removal, then you shouldn't need to worry about books not working on a new device.
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