Spoke weight isn't rocket science, and there's no secret or magic involved. All spokes use steels with very similar (if not identical) specific gravities (density) so the only way one makes lighter spokes is by making them shorter or thinner. At the same thickness, some makers reduce weight by having the thicker ends shorter than others, but other than that the spoke's weight is a simple function of it's length and section.

The above excludes spokes made of other materials, such as Ti, aluminum or carbon.