It would except for the fact that shoe sizes here, from babies to adults are only denominated in centimetres. If there are international sizes printed on the shoes, they have no meaning to residents in Japan. Check the tag inside your shoes; If they have international sizes printed on them, you’ll see Japan’s is in centimetres, and may have EE (or more Es) next to it to denote width. If there is nothing, then they are standard width.