I am using RTX 2070 for rendering and to my utter surprise, I am getting different rendering results while rendering through Arnold GPU and CPU. CPU rendered image is vibrant and bright while GPU rendered image is dull and dark.
Please share your thoughts on why I am getting 2 different output it should be same.

houdini 17.5 or 18 ? i had some issues with renderman in one daily houdini 18 build. now, i am using rock soild houdini 17.5. it also could be arnold GPU bug. Arnold GPU is in alpha/ beta.
is it on geo, volumes, curves or particles ? physical sky shader ? meshlights ?
which arnold version ? did go back a version and try it again ? which houdini version ?

I am using Houdini 17.5 with Arnold 5.0 (latest version), I don't I am using the beta.
I have tried using all the available lights but unfortunately received the same result.
Here I would like to mention that I am rendering Fur.
I have used old Arnold Version too nor change in output.