Hi Vedat,
We have tested your scene and also see the differences. It has been logged internally in our bugs. Unfortunately, we are still looking into why this is happening. We feel it is best (whenever possible) to save directly from the VFB in EXR format to ensure all data is retained in the image. The VFB is the primary image buffer and we then copy that image to Cinema's native Picture viewer. The C4D PV processing is not exposed to us, so we can't say if it has a different gamma for example. If you can save directly from the VFB, then that gives you exactly the result you need. Where that's not possible - using the C4D render queue - then we suggest saving to EXR, as then you have a full range image that can be tweaked afterward if it doesn't get saved by C4D as desired.