There may have been a difference at one point before WD realized what people were commonly using these for, but I was previously using 5 shucked Elements and one MyBook (all 8TB) bought between 2018 and 2024 and they were all the same white label drives.

I havent seen inside a MyPassport but the MyBook is just a standard 3.5" SATA drive with a USB controller attached. For the smaller form factor, I’d imagine they’re more integrated and not able to be shucked which means it could, in theory, be less reliable if the control board broke, but this is just speculation and the odds of that happening are probably pretty low.