iPad 10.9" (10th gen) vs iPad Air 13" (M3)

The iPad 10.9" (10th gen) and iPad Air 13" (M3) are most easily told apart by their overall size. On height, the iPad Air 13" (M3) measures 280.6 mm against the iPad 10.9" (10th gen)'s 248.6 mm — about 32.0 mm more. On width, the iPad Air 13" (M3) measures 214.9 mm against the iPad 10.9" (10th gen)'s 179.5 mm — about 35.4 mm more. On thickness, the iPad 10.9" (10th gen) measures 7.5 mm against the iPad Air 13" (M3)'s 6.1 mm — about 1.4 mm more.

The iPad 10.9" (10th gen) is the heavier of the two at 477 g, compared with 460 g for the iPad Air 13" (M3). That is a 17 g difference (4%). The gap is small enough that you would barely notice it day to day.