The smartshunt can measure voltage of a second 12v battery, having the first bank at 48v
First of all, there is nothing to be said against it.
It is only a voltage measurement at the additional input. However, note the common connection of the “minus” of the load output and the additional battery.
If you only want to monitor the voltage, take a “Victron Smart battery sense” for a fraction of the cost.
I think the Smartshunt is already in the system to measure the 48V. 
Yes, but I want to know if it is possible to monitor the voltage of another 12v battery with the smartshunt auxiliary
Only with the same mass (-)
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Information given here can be verified in the manual
3.5.1. Auxiliary connection for monitoring the voltage of a second battery
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The problem is that Smart battery sense is VE.Smart Network only.
If using the Cerbo GX the VE.Smart Network is not an option