Race eugenicists , for example, think their race is superior to others because of x, y, and z (one of the reasons is almost always about “economic value” too).

Exactly. The intention of eugenics is about the genetic value. If improving economic situation of the majority is the reason for a policy, its utilitarian. A eugenetic policy is always utilitarian under the assumptions of the specific eugenists implementing it. But by overwhelming far majority is not every utilitarian policy a eugenic one. You so far, only prestend utilitarian ideas and not a single instance, where improving the genetic value is the actual intention. A utilitarian policy aiming at economic value and by accident also somehow influencing reproduction behaviour is not eugenic.