Now we are talking about account reconciliation. I think this idea floated on the forum a while back.
For example, you have reconciled your tax account and the figure as per certain date should be $5,000. You want to see if this account balance becomes unreconciled. Just like it works currently for bank accounts.
You are not exactly interested in report matching exactly because layout changes will happen and are imaterial, but you want to ensure specific account balances do not change.