They shouldn't be replaced with just any cap of same uF and voltage, they need to be of same or better ripple tolerance and ESR (higher ripple is better, lower ESR is better).
Can't find specs of Illinois caps 'JWT' series.
The Panny FJ 2200uF 6.3V 10x20 are 2550 ripple / 0.013 ESR => might work OK, but they are inferior to the MCZs (lower ripple, higher ESR => badder).
On Precision 470 cooling: Do these Northbridge caps benefit from the flow inside the green ducts? Or do they remain outside the ducts?
From these pics it looks like they are in a dead zone right between the ducts: