Hi there,
As mentioned before, this looks like you're using different gamma settings.
Could you please make sure you're using the Linear workflow option and basic color management?
You can find these settings if you press Ctrl + D on your keyboard (use Cmd key if you're using MacOS) as this will open the "Project settings" in the "Attributes" panel (under the "Object manager" panel).
Then, open the Color Management section and double-check if the Linear Workflow is enabled or not (if it's disabled, then enable it)
Additionally, for the color management, set it to use "Basic" instead of "OpenColorIO", and lastly, make sure the "Input color profile" is set to "sRGB"
These are the default settings for C4D.
I hope this helps.
Try again and let us know if the issue persists.
Kind regards.