Apple Watch Series 10 (46mm) vs Apple Watch Series 11 (45mm)

The Apple Watch Series 10 (46mm) and Apple Watch Series 11 (45mm) are most easily told apart by their overall size. On height, the Apple Watch Series 11 (45mm) measures 47.0 mm against the Apple Watch Series 10 (46mm)'s 46.0 mm — about 1.0 mm more. They match almost exactly in width, at 39.4 mm. On thickness, the Apple Watch Series 11 (45mm) measures 10.8 mm against the Apple Watch Series 10 (46mm)'s 9.7 mm — about 1.1 mm more.

The Apple Watch Series 11 (45mm) is the heavier of the two at 39 g, compared with 34.2 g for the Apple Watch Series 10 (46mm). That is a 4.799999999999997 g difference (14%). The gap is small enough that you would barely notice it day to day.