Strength and power are related but not the same. Strength is how much force you can produce; power is force multiplied by velocity, how quickly you can produce it.
For most endurance athletes, a base of heavy strength work is the first priority; it tends to improve economy and resilience
Power and reactive work (jumps, hops, sprints) builds on that base and may help stiffness and running economy
Heavy strength work with low reps does not seem to add bulk in endurance athletes who keep a high training volume
For sprint finishes, hills and surges, both qualities contribute
A simple order across a season: early base, 6-8 weeks of heavy strength (3-6 reps); then keep one heavy lift and add power elements such as box jumps, bounds or short hill sprints; close to races, a small maintenance dose of both.