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Try selecting all your copies, then select your original object and press Ctrl+LCtrlL - Object Data. After that, changing the data of your original object should cause changes in copies.
Try selecting all your copies, then select your original object and press Ctrl+L - Object Data. After that, changing the data of your original object should cause changes in copies.
Try selecting all your copies, then select your original object and press CtrlL - Object Data. After that, changing the data of your original object should cause changes in copies.
Try selecting all your copies, then select your original object and press Ctrl+L - Object Data. After that, changing the data of your original object should cause changes in copies.
