Super area vs carpet area: The real cost trap in Noida Extension

Been looking for a 3BHK in Sector 22 Yamuna Expressway for months now, upgrading from my current 2BHK. Builders like Greenarc Homes quote super area, but carpet area is so much less. Feels like a major trap, honestly. Kitna extra lag jaata hai with hidden charges at possession? Already have an EMI, don't want surprises. Any advice on this?