The terms “pitch” and “lead” can be confusing. Pitch is the distance between threads on the screw. Lead is the distance the nut (and hence the router) moves with one full rotation of the screw. The two values are related by the number of starts. If you look at the end of the screw, you should be able to see the number of threads that start at that end.
This post (Don't understand number I needed to calibrate my Z axis) might help you visualize the difference.