Marcel
You are never disappointing
However, as most already realise, I use secondary sources since primary research is out of my reach.
The loss you describe as occuring 19/20 Feb 1943 is listed by Michael Balss as occuring the night before, that is 18/19 Feb, in both his books.
In his second book he updates the information still quoting the same date (18/19 Feb) saying both crewmembers were killed and that the aircraft code was D5+CN.
As to the correct date, I have no idea, but perhaps you can verify 100% you have the correct date and not Michael?
Cheers
Stig