Borrowing a sensory word for an intellectual meaning, or the reverse, is perfectly possible. But a purely sensory common feature would have to be a perceptible configuration present as such in both meanings; that cannot be established for an abstract relatum.
“Faṣdaʿ” connects physical splitting with proclamation through uncovering, while “ṭaghā al-māʾ” connects rebellion with flood-water through excess beyond a bound. Both connections are intelligible relations.
Here “intellectual” does not mean fictitious or unfounded. It means a common feature grasped through a conceptual relation rather than merely through an outward sense.