LDR is the Scene Capture 2D before post processing, so using HDR is going to give you the closest results to your players camera.
What I would do is make sure your Scene Capture 2D actor matches whatever the world Post Process Settings/Active Player Camera Post Process settings. This can be confusing as there is a World Post Processing (usually a volume) and then you have your player’s Camera Post Processing settings. There are a lot of ‘Show Flags’ within the Scene Capture 2D actor as well.
Go through all of these very carefully and get the settings to match up. Keep in mind, the scene capture resolution and size can be changed, which will affect the overall performance and quality of the image. Working with Scene Capture 2D’s need to be handled carefully as they can quickly bog down your project, since you are essentially rendering the scene again.
Cheers,