Discontinued DSC 4 Wire Smoke Detectors

My question is whether or not the System Sensor RRS-Mod will work with the DSC smokes as well as the system sensor. Our problem is we have some installs only a year or 2 old and can not get replacement DSC smokes anymore. I know the DSC prm4w relay will not work with the system sensor 4wtab smokes. Not looking forward to having to tell a customer they need to change all there smokes if one fails. Would like to be able to swap out defective DSC Smokes for System Sensor in the future as problems arise.
Thanks for any info on this!