Hi,
I rendered the same scene with Corona 9 and Corona 10 and saw a massive difference in the render in term of lighting.
The scene is lit by an HDRI and there's a real difference in the rendering of the shadows: they are sharp in Corona 9, and blurred in Corona 10. So basically all the lighting rendering changed from Corona 9 to Corona 10. It's as if there was a Gamma correction applied to the map in Corona 10.
Here are some crop renders showing you the issue, and the HDRI settings: