Why early English iron guns would force an Iberian naval response

Would Spain and Portugal adopt heavy cannon armament earlier if England had reliable cast-iron guns in 1510?

Yes, in this scenario they would have to match the English battery advantage, accelerating heavier armament and ships designed around standard guns.

English ships carrying reliable, uniform heavy batteries would force Spain and Portugal to reconsider their own armament. The proposed response is earlier adoption of large cannon batteries because ships designed primarily around other methods of fighting would face a severe disadvantage. Standard guns would also influence hull design, encouraging ships built around predictable batteries on several decks. An imagined 64-gun arrangement illustrates the direction of change, rather than specifying a design that existed in 1510. The comparison ends with Spain's continuing emphasis on boarding in the Armada period.