This isn't math...you can't combined those two to arrive at the right "D". as noted above...those syrups are about flavors more than color.
the process of making candy syrup involved controlled heating. at the temp of the sugar syrup increases the sugars caramelize. While the color does change, so does flavor. Different flavors are developed as the temperatures change. 90, 180 and 240 are all going to have flavor differences. maybe subtle but still different.
If you don't have mayo you simply cannot mix ketchup and mustard and expect the same result.