They're are some differences beside the
coils, mainly being the dual coil stem is longer, has a fatter rubber seal, and the connector at the bottom is different, but yet it does work. Some people prefer the single
coils versus the dual coils, as they use less battery life, and thus run at lower volts and they're cheaper for the most part I believe. The opposite doesn't work though as the stem is to big. Hope that helps!