Products sold in Japan need to meet JIS (Japanese Industrial Standard Committee) standard and products sold in the U.S. need to meet UL (Underwriters' Laboratory) standard. It is nothing usual that products sold in the U.S. is not sold in Japan. Difference of the products can be very minimal where the pan can be interchangeable, but likely if you tell store people using product name and product number from the U.S. then store employees in Japan will not know what product or what parts you are looking at. The equivalent product and parts in Japan likely have different product name and product number in Japan.

It is possible that you have to contact Zojirushi directly and somebody from international sales have to look up to find out what is equivalent part sold in Japan.