Both are important, but one is a box variant and one is a seal variant. Since we don't just grade sealed, we have to take into account that these can also exist as open, so it would make the same item have multiple variants if the seal type was listed in the box variant field of a sealed game, and would change if the same game was opened.
For this reason, stickers placed on a box before sealing are listed in the box variant field and stickers placed over the seal (or something like xbox "disc made in mexico" that is printed on the seal) are listed as part of the seal rating. They are kept separate so they are fluid on either state (sealed or CIB).