Is there a difference between these two?

Actually they aren't the same drive. The retail is a KS model and the OEM is an AAKS model which is newer and uses less, but denser platters. Performance, heat and power draw characteristics should be better with that one.
 
The retail drive comes with a nice box and most likely a SATA cable, probably one of WD's ``secure connect'' cables.
I would get this drive, because I like the vendor's shipping methods better.
 
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