My Passport WDBYFT0040BBK-WESN vs My Passport Ultra WDBFTM0040BBL-WESN specs

ANybody have one of these and know what the drive rpm is and the buffer size?
what about the WDBFTM0040BBL-WESN 4tb My Passport Ultra versus this one? What’s the difference between My Passport and My Passport Ultra? Name? crystaldiskinfo can provide this info. anybody done a crystaldiskmark on these to see what their throughput r/w bandwidth is? Sata 3 600Mbps?