If the physical sensors are the same size, that means better sensitivity to low light, all other things being equal. This is because having larger pixels allows more light per pixel. It's why actual cameras do better. The larger the pixel size, the better the per pixel detail.
Another unknown is the focal length between the two. I'm guessing that the wide angle has a shorter focal length, which will also affect how aperture is considered. Basically, a shorter focal length can achieve the same light gathering with a higher aperture number as a longer focal length with a smaller aperture. This explains it with some visuals.
https://youtu.be/f5zN6NVx-hY
So, again I'm speculating here, the light hitting the sensor is probably close enough that you wouldn't notice much difference between the two cameras. The 8MP doesn't bother me either. It's more than enough for social media and respectable printing sizes. It doesn't look like it has image stabilization, but that may not matter on that wide of an angle image. If it is more light sensitive, then you can shoot at a higher speed, which also makes images more sharp.
TL;DR version: It may be possible that the wide angle camera is just as good, if not better in low light conditions as the main camera.