How to link servos?

I'm just getting into robotics and I'm a little confused. I'm using servos, but the 90 position on one is not the same as the 90 position on the other. I'm pretty sure this is due to the limited range of motion and how its manufactured but its from the same brand. Is there a way to make them have the same area of motion. (Sorry if this is hard to understand, I didn't really know how to word it correctly)