Not sure especially since the Japanese company 7 and i holdings now owns even the American 7-11 brand.
But having lived in Japan, I also missed some of the North American 7-11 food: pizza[1], hot dogs[2], and slurpees are not available at 7-11 in Japan.
[1] They have pizza bread which is fluffy bread with a sprinkling of onions, corn, tomato sauce and mayo which is not great
[2] They have hot dogs but it's fluffy bread with a toothpick-diameter sausage inside. It's a shame because they also sell decent deep-fried on a stick but without the bun
But having lived in Japan, I also missed some of the North American 7-11 food: pizza[1], hot dogs[2], and slurpees are not available at 7-11 in Japan.
[1] They have pizza bread which is fluffy bread with a sprinkling of onions, corn, tomato sauce and mayo which is not great [2] They have hot dogs but it's fluffy bread with a toothpick-diameter sausage inside. It's a shame because they also sell decent deep-fried on a stick but without the bun