Thus Scimago were only update based on algorithm on Scopus All the metadata have been provided by Scopus /Elsevier in their last update sent to SCImago, including the Coverage's period data. The latest was released on april 2020. you can check on ttps://www.scimagojr.com/journalsearch
I agree to Mr Fady M. A Hassouna; however, SCIMAGO team updates their website after several weeks. The variation between the quartiles of both indicators might occurs due to this synchronization factor.
Thus Scimago were only update based on algorithm on Scopus All the metadata have been provided by Scopus /Elsevier in their last update sent to SCImago, including the Coverage's period data. The latest was released on april 2020. you can check on ttps://www.scimagojr.com/journalsearch