The side by side coils are round or oval, and wired together in series. Let's say the side by side coils are wound opposite (one clockwise and one counterclockwise) to match the direction of travel of the twisted coil's loops. Each of the side by side coils has the same number of turns as the twisted coil. All other parameters (wire gauge, etc.) are the same. Are these functionally identical in every way, or would there be a difference? If there is a difference, what would it be? Would there be mutual inductance between the loops of the fig 8 even though they are not separate coils?