Does the CPMT NE(wcopy) transaction work for IMS MPR programs as it does for CICS programs.  Or is there something different to be done for IMS programs?

Simply replace the executable. The executable is reloaded each time the MPP is scheduled.

If the system is busy, and you are not using int/gnt, you may need to stop the transaction(s) so that the OS will permit replacing the dll/shared object.