Help with EHD

I need to add a 2nd EHD to my hopper. And I've pretty much decided on the 2TB WD My Book. But Amazon shows two different units and I can't tell the difference. Does anyone know?

WDBFJK0020HBK-NESN, the Amazon picture shows it coming in a blue box. And description says "My Book desktop external hard drive-USB 3.0"

WDBACW0020HBK-NESN, the Amazon picture shows a green box with the words My Book Essential. The description says "My Book External hard drive storage USB 3.0"

Now the obvious...

Help with EHD