If the title was confusing to you, let me explain in further detail. I have Suzanne here, and I want her to show the surface reflection of an HDRI environment background picture I have set up, but in the actual render, I want to have a different color, or picture show in the background. But I still want her to reflect the first environment background. Is it possible?
Now yes, it is a posiblity to export a render with a transparent background, and edit said render in Photoshop or Afterfx if it's a video, but is it possible to do in blender?