The key update in the 2020 version is the specification of a standardized way to embed the 17442 code (as represented in ISO 17442-1:2020) in digital certificates. The digitization method is presented through the addition of 17442-2 “Application in Digital Certificates." Also, see the link here to a press release from the Global Legal Entity Identifier Foundation about the use of LEI in digital certificates. https://www.gleif.org/en/newsroom/press-releases/iso-standardizes-the-process-of-embedding-leis-in-digital-certificates
Also, please find the recent article on “What is LEI? here.