For number 3: no emblem, because it’s Italy For number 13: no emblem, because it’s Yemen For number 21: no emblem, because it’s the Netherlands For number 23: no emblem, because it’s Colombia For number 24, it’s dumb, since it can be used to make the Morocco and Vietnam flag
you can differentiate the flags of vietnam and morocco since the one of morocco has a slightly darker red, the one of vietnam is a light red, also with mexico and italy, the one of mexico has a darker green