Universal, the Apple 7 and 8 watch band and other accessories are basically universal. It depends on what accessories, if it is a screen, motherboard or battery these specific accessories, it is not OK. Because their motherboards are different and other general not common. If the motherboard is small electronic components, such as resistors may be common.
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The Apple watch s7 and s8 have the same strap size, so the straps are universal. However, it should be noted that different materials and colors of the strap may affect the appearance and match. In addition, different models of Apple watch may have different functions and applicability, so you need to choose the right band and model according to your needs.