There's no difference between classical and quantum systems regarding the fulfillment of physical constraints: All energy or information exchanges and interactions that unfold into reality must conform to the invariant ratios represented by the universal constants, regardless of the phenomena considered or the classification (classical or quantum) that material observers might infer about their nature.

The universal constants are the "checksum" algorithm that keeps reality self-consistent regardless of the observer's frame of reference, ensuring that conservation laws and entanglement are enforced no matter what puzzling relationships between events in spacetime observers might infer.