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It would have been a tough game for PSG if they were playing against Barcelona in the finals. Barcelona has a stronger squad that is capable of challenging PSG. If Barcelona were to be in the finals of the Champions League, it would have been a privilege that they would not have allowed to be missed easily, and PSG have also been looking for a way to win the Champions League trophy. The game would have been tough, but Barcelona would have had better chances of winning.
Not necessarily, what you believe is just speculation, but in general, maybe the final result will not be like when they beat Inter because both have the same philosophy. But in reality, Barcelona was unable to do much when facing Inter, small mistakes made by Barcelona players destroyed their plans instantly.
PSG's success in winning the first UCL trophy in their history was due to Inter not playing like when they beat Barcelona. Obviously the final result in the UCL final was not desired by all parties (except those involved with PSG), however surprises always come at any time in football.