one difference is that in fire red there are oddish but no bellsprout, and visa versa for leaf green
I'm not sure but I think the different Pokemons you can catch
ex.you can catch a bellsprout on leaf green while fire red cant(Or reverse)
From:Reian Viloria
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Firered and leafgreen both can catch different Pokemon but there pokedex is the same, here is some examples: magmar only in leafgreen not firered, oddish in firered not leafgreen, ekans in firered not leafgreen, bellsprout in leafgreen not firered, pinsir in leafgreen not firered.
lots of Pokemon can be only caught in firered and leafgreen like mewtwo and raikou, suicune, entei, articuno, zapdos, moltres. Plus the kanto starters bulbusaur, squirtle, charmander.
Ruby, sapphire, another emerald or firered and leafgreen. Must have national dex for all games and for firered and leafgreen you need to get the ruby and sapphire and give it to celio on one island.
Pokemon Red was the original Pokemon game on the GameBoy along with Pokemon Blue. Pokemon FireRed is the GameBoy Advance remake that is massively updated. FireRed has all the new Pokemon introduced since Red and Blue along with new mechanics, better balancing and significantly updated graphics.
You cannot "trade" pokemon between Pokemon FireRed and Pokemon Pearl. Instead, pokemon from Pokemon FireRed Version can be transferred to Pokemon Pearl via Pal Park.