Old system yes, SWM no. Some say they've done it before but I've never seen it or been able to successfully get it to work. SWM and cable run on nearly the same frequency (from what I understand) so it causes a huge mix up between signals.
There is also a swm diplexor with mrv/Deccca filtering called the SD SWMD3. This model provides MRV isolation with the same sort filtering that is in a green lable SWM splitter so it will cut out a chunk of your cable channels. most helpful if your are providing an analog/digital headend alongside a SWM MDU installation. In this case you would be avoiding the MRV frequencies (475 - 625 MHz) when designing your headend channel lineup.