Difference Between Model & Mfg Part Number

HGST Products HGST Internal Drives
1

Guys - Can someone confirm what is the actual Mfg part number for this item? HUS726020AL5210
I am assuming that the above is a model and this is the actual Mfg part Number “0F22799”.

https://www.hgst.com/products/hard-drives/ultrastar-7k6000

I have a bunch of other examples as well.