I second guess myself on my wrap count all the time. When I do forgot if I did either the amount of wraps on my other coil, I will space them out and use my tweezers to count the wraps to make sure they have an equal amount of wraps and fix as needed. If you're like me and prefer contact coils, then you can pinch them back together when you dry fire your coils.
Im not sure, but I believe as long as your coil ohms out so it isn't pulling an unsafe amount of amps from your batteries, you should be fine. Its just a small pain if you build for something like a series mod or you vape high wattage, because one wick is going to dry up a bit faster than the other.