Two objects may share the concept “black” while one is darker than the other. The differing intensity does not automatically create two unrelated meanings of blackness. What the quality is and how much of it is displayed are separate questions.
The same distinction applies to running and flying. Both can involve rapid movement, while the borrowed flight-image makes the rapidity more striking. That asymmetry is often precisely what makes a metaphor rhetorically effective.
If complete equality were required for analogy, many powerful similes and metaphors would be excluded without good reason. Similarity does not mean identity in all measurable aspects.