External drive pricing

Can anyone tell me why the WD 4TB My Book Desktop External Hard Drive - USB 3.0 - WDBFJK0040HBK is so much more expensive than the WD 4TB My Book Desktop External Hard Drive - USB 3.0 - WDBBGB0040HBK?
I have a failing drive that needs to be replaced and I’m on a restrictive budget. I have My Passport that I really like. Are they more durable than the My Book?