If your design uses the 2023 Edition of Section VIII, you must use the 2023 Edition of Section II. Why? Because the allowable stress values change. A material allowed at 20 ksi in 2019 might be de-rated to 18.5 ksi in 2023 due to new fatigue data. Using the wrong edition creates a non-compliant vessel.
The most common mistake in the industry is mixing code editions. ASME updates Section II every two years. asme boiler and pressure vessel code section ii
Demystifying ASME BPVC Section II: The Material Gatekeeper of Pressure Vessel Safety If your design uses the 2023 Edition of