Hi Faith,
 
Yes square would make a difference. The process is wet surface area dependent.
 
A square of  one millimeter wire has more surface area than a one millimeter 
diameter wire.
 
The square would be 4 X width x wet length and the wire wouild be 3.1416 X 
diameter x wet length.
 
That difference would change the brew time for the same current density.
 
"Ole Bob"