They are 2 different series of cameras representing different features.
The 2231 is from the Lite series (budget camera) so it doesn't have AI and the processor/firmware is weaker than in the 5241 that has AI built-in and the LUX specs are a lot better in the 5241 (
0.002 Lux@F1.6 (Color, 30 IRE) versus
0.0007 lux@F1.6 (Color, 30 IRE)
While sensor size does come into play, what the camera does with the firmware to process the image comes into play as well.
That is why we don't recommend Reolink, not even their 1/2.8" 2MP camera with Starlight sensors (same that some Dahua's have) because their algorithm/firmware is designed around a nice bright static image, but motion is a blur.
This is an example from Reolink's marketing videos of their Starlight camera - do you see a person in this picture...yes, there is a person in this picture. This is why you cannot buy a system based on marketing terms like Starlight.... Could this provide anything useful for the police? Would this protect your home? The still picture looks great though except for the person and the blur of the vehicle... Will give you a hint - the person is in between the two columns:
View attachment 174560
Bad Boys
Bad Boys
Watcha gonna do
Watcha gonna do
When the camera can't see you