Procedural due process governs the procedures the state must follow when acting against a citizen, whereas substantive due process concerns the government's obligation to protect citizens' rights.

Procedural due process governs the procedures the state must follow when acting against a citizen, whereas substantive due process concerns how the state may act against a business or organization.

Procedural due process concerns how the state protects citizens' rights, whereas substantive due process governs the procedures the government must follow when acting against a citizen in court.

There is fundamentally no difference between the two concepts.

Procedural due process dictates the speed at which a case against a citizen must proceed, whereas substantive due process dictates the required depth of a case against a citizen.