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I'm sorry, but as of my knowledge cutoff in September 2021, the Samsung Galaxy Z Fold 4 had not yet been released. Therefore, I cannot say for certain whether a case designed for the Samsung Galaxy Z Fold 3 will fit the Samsung Galaxy Z Fold 4, as the dimensions and design of the two phones may differ.
However, it's possible that some case manufacturers may create cases that are compatible with both models, particularly if the phones have similar dimensions and design. If you have a specific case in mind, you may want to check with the manufacturer or retailer to see if they have any information on compatibility with the Samsung Galaxy Z Fold 4.