HI.
It is not possible to see the photo, but these modules are compatible, so make the comparison.
Memory Module Data Sheet DDR3-1600(CL11) 240-Pin ECC U-DIMM 8GB
Product Model Z400
Maximum memory 16 GB with 4 DIMM Base Unit, 24 GB with base unit 6 DIMM
Memory slots 4 sockets or 6 sockets
Intel Xeon / Intel X58 CPU / Chipset
-U-DIMM DDR3 ECC 1333 1.5V
-U-DIMM DDR3 ECC 1600 1.5V
-http://www.kingston.com/en/memory/search?devicetype=1&mfr=HEW&line=Workstation&model=55069
-http://eu.crucial.com/eur/en/compatible-upgrade-for//hp-z400-workstation-%284-dimm-slots%29
Regards.