Check the compression on those cylinders, that will let you know if you have a base engine problem like a bent valve. Then might be worth swapping the injectors from 4-5, 6-7. Long shot on the injectors but, would be good to know that. Otherwise I have seen the cam sensors cause odd misfire/cam sensor faults. Might be able to swap the sensors from bank 1 to bank 2 as well then see if the faults follow. Let us know!
Porsche Cayenne Compression Test | 2003-2008 | Pelican Parts DIY Maintenance Article
Porsche Cayenne Camshaft Position Sensor Replacement | 2003-2008 | Pelican Parts DIY Maintenance Article