Hi, both models have the same Capacity of 1000 - 1200 ml, Voltage of 220 - 240V, and almost identical functions. i.e. their usage is almost exactly the same as each other.
Their difference (other than their design & colour) is that A912SG has a smaller 4 blade grinder, a Heating Power of 820W & weighs 2.4 kg.
A01SG has a longer 3 blade grinder, a higher Heating Power of 1100W & is lighter at 2 kg. Its design is also slightly newer than that of A912SG.
Motor Power: 200W