Croatia has great sqaud that's made up of world class players who in their prime can beat any side in the world. Their midfield maestro is one of the very few midfield players to have ever win the Balon D'or.
However Croatia is never a match to the Brazilian team when it comes to quality players. Brazil's second XI can comfortably beat any team in The word right now. Brazil is the most successful football nation and I think it'll be difficult for anyone to stand them on their day
No need to overestimate Brazil. When was the last time they won the world cup? And forget about their second XI, what happened to their first XI in Qatar 2022? Having talented players in your team is one thing and knowing how to use them as a team is another. Back in Qatar, they had a star-studded side comprised of players like Neymar, Richarlison and Thiago Silva. But what happened during the playoffs? They couldn't even qualify for the semi-finals. As long as Brazil can't play as a team, individual performances from the players won't do them much good.