For historical reference, yes. But for any new project or audit after 2023, auditors expect the 2021 version. The 2012 version is officially withdrawn (as of December 2023).
ISO 21500:2021 - Project, programme and portfolio management iso 21500 pdf 2021 verified
: Detailed project management guidance (processes like planning and control) has been moved to a new companion standard, ISO 21502:2020 Broadened Scope : It emphasizes governance For historical reference, yes