I have no answer but there is only a list of killed and missing members of RSI forces and services here:
http://www.laltraverita.it/elenco_caduti_e_dispersi.htm
The list gives unit of the fallen, and a death location. A quick check of casualties on 6 April 1944 show many ANR names, with different locations, so possibly giving a possibility to group them by death locations as a starting point to form crews.