try hand sewing it, black thread/whatever color they used

you’d probably want to use the stitch holes that are already there

the back tab is the correct color for said model, it also features a better insole, slightly off white foxing tape, and canvas collar lining (better than that cheap fake leather)

use shoe goo, its a flexible, strong rubber adhesive that is easy to apply, wipe off all excess, and its flexible and stretchy so it wont crack/fail like super glue would.

foxing tape tends to do that, so thats why i have a tube of shoe goo on hand.

its a size thing, the soles are the same thickness and the foxing tape is the same height, a size 4 mens authentic will look like it has a taller midsole than a size 18 pair of authentics, even though both have the same height of foxing tape.

i can tell they are different sizes due to the number of eyelets and the proportional size of the eyelets