Different designs for the same model. Why?

I’ve noticed a difference in the appearance for the same model harddrives. For example WD40EZRZ.

In my country the Netherlands I only see the model pictured on the left. Can someone help me figure out what to look for when I want to buy thr exact model on the right?

I got a server with a bunch of them and it would be great if they all looked the same.

Is one perhaps the retail and the other OEM model?
Or is it dependant on where it is manufactured, Malaysia or Thailand?

Hi @Ezio,

Please refer below link to know safe buying guide:
https://support-en.wd.com/app/answers/detail/a_id/28313

Hope it helps!!