If I buy a case for Apple Watch Series 3 will it fit on Series 4?

My sister has an old clear case from her Apple Watch Series 3 that she doesn’t use, and I am getting an Apple Watch Series 4 this year. Will her case fit on the Watch? It covers the screen and the sides.

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    Unfortunately, no the cases won't work between the models. The Series 3 comes in 38 mm and 42 mm sizes, while the Series 4 comes in 40 mm and 44 mm sizes. Additionally, the Series 4 is slightly thinner than the Series 3. Now, a Series 3 case will work with Series 2 and Series 1 watches. All of those watches come in the same available sizes.

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