The 'Aegis' system on the Norwegian vessels are similar to the US Navy version in the same way a goldfish is to a shark. The arrays are considerably smaller, the TX units are less dense and the emitted power is but a fraction. Behind the array the power management would struggle to keep a regular SPY-1 radar warm. The processing power is similarly reduced to reflect the reduced area of the Aegis bubble around the ship.
That said they remain exceptionally capable systems and can totally dominate the area covered by their ESS missiles with capacity to spare. It's just that you need a massive increase in raw power to push the bubble out further and to process the increased levels of contacts, clutter, interference and hostile EW.