I don’t know about the Pedal Power but the HOG needs about 250mA at 9VDC. The HOG’s US AC Adapter will probably work ok in Japan but you would be better off buying the Japanese version of that AC Adapter or using another power supply.
The polarity of the HOG’s power jack is center positive.
You better purchase a HOG’s AC Adapter from US and HOG’s AC Adapter from Japan to make sure it works.