Thanks for the reference of showing that they are separate disks. But on your photo they are definitely of different color, so is it possible that this is an all original disk and no replacements were made?
@dra43b Yes, same thing happens on the 1045, if you look at images of the Grail you'll notice the same effect. Have two and they both show this. As written above this is due to the disks being of different material.