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Apple Watch Series 4, Series 5, and Series 6 come in the 40mm and 44mm case sizes, so they are the same. As long as you get the same size for the new Apple Watch, then the existing bands you have should fit without issue.
Yes, all bands made to fit 38mm earlier series will fit the 4 series 40 mm watch. Also, bands made to fit the older 42mm watch will fit series 4 size 44mm watches.
40mm and 38mm bands are compatible with one another; likewise for 44mm and 42mm bands.
Bands for 38mm, 40mm, and 41mm cases work with each other, and bands for 42mm, 44mm, and 45mm cases work with each other. Most bands designed for Apple Watch Series 4, Apple Watch Series 5, Apple Watch SE, Apple Watch Series 6, and Apple Watch Series 7 work with any previous version of Apple Watch.
You'll notice the strap sizes are now 41mm and 45mm. For those with a Series 1, 2 or 3 Apple Watch, choose the 41mm size for the 38mm model and 45mm size for the 42mm models. For those with a Series 4, 5 or 6, choose the 41mm size for the 40mm model and the 45mm size for the 44mm model.
You can use a band that's designed for Apple Watch (1st generation) and Apple Watch Series 1, 2, and 3 with Apple Watch Series 4 and later and Apple Watch SE as long as the sizes are compatible.
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