How do I compare fields in 2 different indexes and return results only if values are not matching?

[spl_unker]

I would like to construct a query by comparing 2 fields (hash values) in 2 different indexes.(A&B).........

If Hash Value in Index A matches Hash value in Index B then ignore those  results else return results if hashes not matching 

[spl_unker]

@ITWhisperer  I have updated my question.....I have removed my example for better understanding. Let me know if that is clear . TIA

[ITWhisperer]

index="A" OR index="B"
| eventstats count by hash
| where count < 2

[ITWhisperer]

index=A OR index=B
| stats dc(index) as indexes by hostname
| where indexes < 2