The attached images provide no information about noise. What is apparent is that the exposure aprameters are different, the N73 flash fired stronger judging from the shadows. The N900 image is somewhat underexposed (tells nothing about the sensor) and has a slight blue haze as a result of the unfortunate backplate (again, tells nothing about the sensor). If you want to show us the ridiculousness of N900 noise, take pictures under identical conditions, flash OFF, same ISO and then post the (unmodified) results here.