Google's Wear OS 5.1 community post states that the "improved algorithm ... number added. Ultimately, the Pixel Watch 3 and Fenix 8 measured 742 and 745 steps, respectively. My actual count ...

the algorithm will calculate the number of steps as if the Fitbit were about 3 feet not 3 inches above the ground. The estimated step count isn’t completely accurate. In one study, a wrist ...