Wdbbgb0060hbk-nb

Portable Drives My Passport
1

I bought a WDBBGB0060HBK-AESN (this is sold in Australia) but the label on the physical item itself states P/N: WDBBGB0060HBK-NB along with the S/N: WX31Xxxxxxxx (Product of Thailand)
I have seen the PDF explaining the letters but nothing comes up for “NB”
I have also read somewhere that any letters (xESN) after the dash or behind WDBBGB0060HBK is for WD’s internal reference
But can this be said the same for “NB”?