1. Kishoutenketsu prefers to introduce the primary conflict as late as possible, whereas any writer in Hollywood will try to introduce it as early as possible.
2. Kishoutenketsu prefers to frame the primary conflict as a difference in perspective that must be bridged from both sides, rather than outright competition between irreconcilable goals.
These differences aren't fundamental (you can find all the counterexamples you like, especially if you cite movies with twist endings) but they are encouraged by style guides and deliberately (or even subconsciously) prioritized by writers, to varying effect.
