If the only differences that you find can be attributed to the SOGS environment, then it should be safe to copy the existing version of the file into the new IRAF build. If not, you must make the necessary changes to ensure IRAF functionality. The ultimate test of an IRAF installation is to get help and the print capability to work. Read the release notes for the given IRAF build. Pay special attention to changes to any of the IRAF environmental files.
Sanity check the delivered files.
For a VMS system do the following. The dates may be years in the past. Have the O2 bring the pipelines down. Change irafdisk and stsdasdisk to point at the configured pipeline disk for the pipeline. Modify the environmental files as described in the installation notice.