ITIL vs ISO 20000

ITIL Expert is highest personal certification (according to the, previous, v3). ISO 20000 is international standard for IT Service Management aimed for the organizations (although, individuals can be also educated and certified in ISO 20000). So, if you are an ITIL Expert, that doesn't mean your organization is ready to be ISO 20000 certified. But, being ITIL Expert can help a lot if you are implementing ISO 20000.

This article can help you clarify differences (and similarities) between ITIL and ISO 20000 " ITIL vs. ISO/IEC 20000: Similarities and Differences & Process Mapping" https://info.advisera.com/20000academy/free-download/itil-vs-iso-iec-20000-similarities-and-differences-process-mapping