(I see John's replied as I was typing, but hopefully this might still contain something useful)
Exposure and stops I understand - dBs, normalizing, signal noise ratios etc I do not
To steal from Wikipedia: The decibel (dB) is a logarithmic unit used to express the ratio between two values of a physical quantity, often power or intensity."
One confusion is that a 3dB increase is twice the power, but you need 6dB for twice the voltage. IRC in terms of audio, there are claims that 3dB is an actual doubling, but 6dB is perceived as twice the volume.
Normalising in this context I assume to mean taking two different systems and adjusting them to the same scale so a comparison is meaningful. E.g is 16 out of 20 better than 37 out of 50? Scale them both to be n out of 100 and you can compare.
Signal to noise ratio is exactly what it says on the tin; how much signal do I have in relation to noise? Darker ("quieter") pixels are more susceptible to being drowned out by background noise (hence a poor signal to noise ratio). Brighter ("louder") pixels have a signal well above the noise level and thus have good signal to noise.
Actually, Exmor blackframes are very prone to thin horizontal banding at base ISO. It is exposed by the low amount of random noise.
I'll resist the temptation to make a smart*ss comment about banding on Exmor sensors
BTW when I said difference I meant (practically) "visible" as opposed to "measurable". I don't know if that would change the answer.