What are the differences between Apple Watch 3 and 4?

Related questions

1. How deep can the Apple Watch 3 go underwater?
2. What is the difference in the Apple Watch 3 and 4?
3. What does the green dot mean on Apple Watch?
4. Can you make calls on Apple watch without cellular?
5. What is the difference between the 3rd and 4th generation Apple Watch?
6. Does the Apple Watch 3 have GPS?
7. Is the Apple Watch 3 waterproof?
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14. #cellular
15. #977sqmm2