You can now use the REPLACEUnconditional keyword with the RESTORE command when restoring and renaming physical data sets, with either the RENAME or RENAMEUnconditional keyword. If you specify REPLACEUnconditional and RENAMEUnconditional, DFSMSdss may replace preallocated target data sets with the new name. If a new name data set exists, it will be used to restore to it if it is usable. Preallocated target data sets must have the same characteristics as the source data sets. Otherwise, they will be deemed unusable.
For details, refer to the topic about the RESTORE command in z/OS DFSMSdss Storage Administration.