Moments its a limited concept (fixed to single point) therefore we use in statics. Torque in dynamics and is a broad concept not fixed to a single point rather it is irrespective of point of application of moment/force. There's a difference but subtle. Not even palpable in practical problem solving. You can understand the difference by analyzing second condition of equilibrium or rotational equilibrium. And moment and moment arm are not same. moment arm is always distance therefore scalar.

moment when form part of torque means rotational character o force that is applied.