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Typhlosion and Charizard have the exact same stats across the board. I think Game Freak got lazy, because the only difference is their typings.
Same with all of the Gen 2 starters.
Meganium is identical to Venusaur, except its Defense and Special Attack stats are swapped. Typhlosion is completely identical to Charizard, minus the Flying type. Feraligatr's the same as Blastoise, except the HP and Special Attack are swapped, as well as the Attack and Special Defense.