Maybe a better showing on their part and slightly increased British casualties but still the same result and possibly more damage to the Argentine armed forces long term.
Once British forces land in meaningful numbers then it's effectively game over for Argentina (cut off from renforcement/resupply, lacking air cover, under the guns/aircraft of the rn, ect). The way for them to have with won would have been for the Argentine navy/airforce to have inflicted more crippling losses on the rn task force.