Hi, i think i've got some info on this aircraft.
It seems to be a variant of the "Raffica", precisely the Ca.331B, which mounted improved engines, allowing for an higher cruise speed, and presented some others improvements.
You can see it in this page, just scroll to the middle:
http://alternathistory.org.ua/mnogotselevoi-istrebitel-caproni-bergamasca-ca331-raffica-italiya