The main difference between the two models of the Huawei Watch Fit 3 lies in the size and design specifications.

1. Size and dimensions:
- The model mentioned in your question has a size of 43.20 mm and a thickness of 9.9 mm.
- The model on the Italian page has a size of 36.30 mm and a thickness of 9.9 mm.

2. Screen and Display:
- The 43.20 mm model has a 1.82-inch AMOLED display with a resolution of 480 x 408 pixels and 347 pixels per inch.
- The 36.30 mm model also has an AMOLED screen, but with different dimensions and resolution to suit its smaller size.

3. Design and materials:
- Both models use an aluminium alloy body and have interchangeable straps, but the colour and material options for the straps may vary.

These differences indicate that they are not exactly the same watch, although they do share some common features. The main distinction is the size and dimensions of the screen and case.