no differences. only used for engine with 10+ compression ratio.(heavy bikes like honda CBR 150R)
higher octane number means more resistance to pre mature ignite thats it.
if you use low octane ( normal petrol 64rs liter ) on high compression ratio engine then there is chance of premature ignite(knocking) which can blend engine intake/exhaust valve and damage engine .
people claim hi octane give more power and milage but in reality it doesnt .its just a normal fuel with more power to withstand pressure.