WD40PURX vs WD40PURZ

I have a HikVision security system. The network Video Recorder model is DS-7616NI-12/16P
It has 2 WD Hard Drives one of which has failed. Its model number is WD30PURX. Can I replace it with the following model WD40PURZ.
Is there any difference between the PURX and the PURZ?
Thanks

see this:

WD40PURX vs. WD40PURZ