you can do it but the load won't be even like the other's said....basically when you build a dual coil set up you use two coils of the same size wire and wraps to make them draw the same amount of current evenly. That's the basic concept of a dual "parallel" coil build. When you use two different sized wires and the same number of wraps for each coil you unbalance the load....the most current will be drawn to the side of the load with the least amount of resistance so it will heat of faster frying your juice on that side while the lesser coil will heat up slower. If build two coils with the same resistance but different sized wire they still won't heat completely evenly....the thicker the gauge the lower the resistance and the longer it takes to heat up than a thinner wire with a higher resistance....so even though they may have the same resistance reading on the coils they still might not behave the same way because of the number of wraps/gauge difference...i haven't tried this experiment myself but now I think I will right now to see what actually happens....but that's the theory behind it....for what it's worth....I hope this helps.