They are not. The EEA applicable iPad warranty restricts service it to EEA. As for the Japanese one, I lack the Japanese skills to determine whether Apple JP enforces its general iPad/iPhone only clause giving the ability to restrict the warranty.
BTW iPods and Macs are not within the scope of the warranty limitation.
I assume that would be because of the additional length requirements for EEA products? I can say for sure that I have received service in the UK for my US iPhones and Macs