I beleive service voltage is unified at ~ 100V. Most electronics would be fine, as most electronics have a conversion to DC somewhere and that's unlikely to fail with a 20% difference in frequency. AC driven motors might not like to be moved, but might be OK given the domestic reality (unintended protectionism for stand mixers!). Line frequency clocks probably aren't sold in Japan or need jumpers/switches or would need to be replaced when crossing the frequency border.