I've uploaded 3 files at iSO 800 , 1/15 sec so you can see FCam vs Camera-UI2 output. These are 100% crops. It's rather interesting because the exposures are fairly similar but the white balance is completely different. The Camera-UI2 output is noisier but the white balance is perhaps more accurate.

The first is the JPEG output for reference, the second is the Camera-UI2 and the third is FCAM