What is the difference between Apple Watch Series 4 40mm and 44mm?

Related questions

1. Do Apple watch bands fit all series?
2. Do old bands work on Apple Watch 4?
3. Is 44mm Apple watch too big?
4. Are Apple watches waterproof?
5. Do old Apple Watch 4 bands fit?
6. Can you use 38mm band on 40mm Apple Watch?
7. Is the Apple Watch heart monitor accurate?
8. Why are watches worn on the left wrist?
9. Will a 40mm Apple watch band fit a 38mm watch?
10. Does Apple watch bands work with Series 4?

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18. #height