SoM computers more than Inventory computers

SoM computers more than Inventory computers

In our Desktop Central, I've noticed that when you go to SoM > Computers, it lists around 1400 computers. But when you go to Inventory > Computers, it lists around 1300. Why is there a 100+ difference in listings?
Can we add the asset tag/serial number column to the SoM > Computer report?

We're trying to determine why the discrepancy in numbers, and how it's affecting our patch numbers. 

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