An interesting question here - Belgium and England play and the winner wins the group G and the loser is guaranteed 2nd place in the group.
The winner moves to the left side of the bracket and the lose moves to the right side of the bracket. Look at the bracket here - isn't there a much easier path on the right side of the bracket for the second place team (the team that loses today's match?) Furthermore, both would be favored against their first round opponent - a team from Group H, but the winner of today would get Brazil/Mexico in the 2nd round and the loser would get Sweden/Switzerland in the 2nd round.
England currently holds the tie breaker - they both have the same goal differential, the same goals scores, but England leads on fair play with less yellow cards.
It probably doesn't matter, but it may be an easier path forward if Belgium or England loses today as weird as that sounds.