Question: are there different size apple watch chargers?
Answer: The dimensions for the metal charger that comes with the Watch: 2.08" (52.83 mm) diameter and 0.25" (6.35 mm) thickness. The dimensions for the plastic covered charger that comes with the Sport: 2.08" (52.83 mm) diameter and 0.30" (7.62 mm) thickness. So there is a minor difference in thickness.