Traditionally Chinese fried rice is typically brown unless it's a curried fried rice or house special fried rice. But it's the curry powder which in turn contains TURMERIC. It's not saffron, it's plain old turmeric that gives a yellow color with no extra flavor really. Now if you make your own you can always get the Yellow rice packs in the grocery store which these contain saffron.
What is the difference?
Turmeric is a spice made from grinding the roots of the Curcuma longa plant, also called curcumin. It is a prime ingredient in curry powder and figures heavily in Asian cuisines. Because it imparts a vivid yellow color to the food it is cooked with, it is often used to color as well as flavor condiments, rice dishes and sauces.
Turmeric's active ingredient is curcumin. It is thought to be an anti-inflammatory, as well as an antioxidant. Antioxidants are substances that are thought to help prevent aging by inhibiting the breakdown of cells by oxidation.
Saffron is a very costly spice, used to flavor and color food. The spice is actually the dried stigma (tiny threadlike strands) of the Crocus Sativus Linneaus, a member of the iris family. A flower's stigma accepts the pollen that is produced by the stamen, which becomes the seeds of the next generation. Each stigma is very small, and tens of thousands of individual strands go into a single ounce of the spice; since the stigmas are hand-plucked from the individual flowers, saffron's high cost becomes more understandable. It is thought that saffron is the most expensive spice in the world.