WD40PURX and WD40EVRX

WD Internal Drives Internal Drives
1

There is a two types of HDD in the stock, WD40PURX and WD40EVRX . In the space there is no different between it.
https://www.manualslib.com/manual/1556172/Western-Digital-Purple-Pr1334m.html?page=16#manual

Can someone explain the real difference?

2

They are all from the same range:
View:
https://kz.micro-semiconductor.hk/datasheet/36-96HD4TB-ST-WD5KA1.pdf