For login you need a virtual user card - for this you have to fill out an application and forward it together with a double-sided copy/scan/photo of the ID card to the ZB MED, see https://www.zbmed.de/en/search-find/e-books-and-e-journals/remote-access/.
The difference to our licenses is shown on the Journals page in the the section "Search for E-Journals" > "Remote access via ZB MED", for example full access to 75 biomedical Mary Ann Liebert journals.