The effective number of turns is the same as the number of turns on each winding. But note, this parallel connection is effectively the same as a single winding made with wire of twice the area. If we connect them in parallel, then a total of twice the winding current flows, and the voltage is the same as the individual windings. The total number of turns is twice that of each winding. If we connect them in series, then a total of one winding current flows, and the total voltage across the windings is twice that of each individual winding. Now we have a choice whether to connect these two windings in series, or in parallel.

Imagine the winding space is wound with two identical windings.

This applies to BLDC motors, electromagnets, transformers etc.

TL DR The torque is independent of the gauge of wire and number of turns, other things (winding volume, heat generated) being equal