Correct MOSFET choice for brushed DC motor
I'm not going to do a direct answer: -

A good start is to look at absolute maximum voltages and current and check that any potential MOSFET you choose is ~ twice as good as what you believe you need for your circuit.

Next, I'd look at what the SSM3K123TU device does for you and this graph is very important: -



It tells you plenty of things about how good it will be at delivering power to the motor whilst not getting too warm itself. For instance, with a 1.2 volt gate-source drive and a 1A load (motor) you might expect to see an 70mV drop across the MOSFET. This is a power dissipation of 70mW. However, if your circuit could drive the gate with 4 volts, expect only a 20mV drop across the MOSFET when delivering 1A to the motor.

So that's it in simple terms - choose a MOSFET that matches what the SSM3K123TU delivers in these respects and you are likely to be able to make a long list of potential mosfets turn into a short list.