The Apple Watch Series 9 design is identical to the Watch Series 8 to the millimetre, but the brighter display and the new SiP makes all the difference.
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Apple Watch Difference Between Series 8 and 9: Key Upgrades Analyzed - GadgetMates
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Buy Apple Watch Series 9 GPS, 45mm Midnight Aluminum Case with Midnight Sport Band - S/M - Apple
Apple Watch Series 9 vs Watch SE: Which one is right for you?
Is the new Apple Watch Series 9 that different from it's predecessor? We go head-to-head with the Apple Watch Series 9 vs Series 8 to find out what's changed.
Apple Watch Series 8 vs. Series 9 Buyer's Guide: 10+ Upgrades Compared - MacRumors
Apple Watch Series 9 vs Apple Watch Series 8: Which one to get? - Reviewed