In practice, only genuine Manfrotto RC2/200PL plates and clamps should be assumed to be fully compatible with each other. Third-party versions may look similar, but tolerances often differ enough that the fit can be loose, inconsistent, or may not work at all. That also means you should not count on full compatibility with the safety/secondary locking features unless both parts are genuine RC2/200PL components. If reliable fit and security matter, stick with genuine Manfrotto RC2/200PL plates and clamps rather than assuming lookalike parts are interchangeable.