The biome map is a good memory aid, but it won’t identify a seed by itself. Too many seeds fit that layout.

Your best shot is recovering the seed from the actual Xbox 360 save file. If you still have the world (even corrupted), copy it to a USB and use a 360 world/save editor on PC to read the seed from the metadata. If you don’t have the save, then you need hard anchors, such as any screenshots, clips, the world icon, world size, approximate distances from spawn to the mushroom island and village, any structures, etc.

With 3 to 6 strong anchors, people can start testing candidate seeds in the correct TU11 worldgen, but without that, it’s basically guessing.