What is the difference between the 40mm and 44mm Apple Watch?

Related questions

1. Does Apple Watch 4 Use same bands?
2. Will a 40mm Apple watch band fit a 38mm watch?
3. Is 44mm Apple watch too big?
4. Can you use 38mm band on 40mm Apple Watch?
5. Are Apple watches waterproof?
6. What is the difference between the Iwatch 3 and 4?
7. Is a 44mm watch too big?
8. Does the Apple Watch 3 band fit the Apple Watch 4?
9. Do old bands work on Apple Watch 4?
10. Do Apple watch bands work with Series 4?

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