What is significance of BOM Code, Hardware Version ?

For example,

Hardware Version	Board BOM Item	Description
CR56RPUA REV A	03030JTW	NetEngine80E,Main Processing Unit B4
CR56RPUA REV A	03030KSR	NetEngine40E,Switch and Route Processing Unit **
CR56RPUA REV B	03030KSR	NetEngine40E,Switch and Route Processing Unit **

All three listed entries above have different use, how can classify them?

Board Bom item is the only identifier of the hardware.

If you want to search for a board, you can use bom code instead of the hardware name.

Thanks Echoo