I don’t think there is any single club that could beat the Brazilians over a season of play. But I do think that there are club teams that could beat many of the national sides regularly; particularly the national sides not found in Pot A of the draw this year, and even one or maybe two of the ones in Pot A (in addition, of course, to South Africa, which were in the seeded pot only because they are hosting).
If you look at the top club teams, many of their players are either regularly called up by their national teams, or in contention to be called up by them. Still, not everyone on the roster is at that level, and of course, everyone on the national side for England IS at that level, so even if you could clone Wayne Rooney and other members of Manchester United, for example, who play on the England squad regularly, there is still a potential talent gap.
Of course, the flip side of the coin is that the club sides play together regularly, whereas the national sides get together a few times each year for a week or so, play one or two games, then go back to their clubs. That makes the level of understanding between/among the players less deep, impacting the quality of play at times.
I think that when it gets to the level of, say, the USA Men’s National Team, they would be mid-table at best in the English Premier League, or Serie A in Italy, or La Liga in Spain, and possibly a bit higher in the Bundesliga in Germany.