The first paragraph of 5.24.1.1: "Qualification established with any one of the steels allowed by this code shall be considered as qualification to weld or tack weld any of the other steels, with the following exception"
and then the reference to Fy >=90 ksi is the exception.
So for every grade of ASTM A709 except HPS 100W, you don't have to match the welder qual grade to the project.
Hg