1KRFE Engine has compression ratio of 10.5:1 hence required minimum 90 RON Petrol,
whereas regular petrol has 87 RON & HOBC has 97 RON in Pakistan (
so there is no harm in using the HOBC in the Passo having 1KRFE engine as the higher the RON the higher the ability to compress and avoid detonation.
also the ECU controls the knocking with the help of Knock sensor and adjust the combustion timing accordingly.
if the knocking is audible to driver then you must at first change your fuel to HOBC and if the problem persists get it checked by some reliable mechanic.