The best solution is to try and find a profile of a Fw190A-5 used by Anton Hackl.
Hackl certainly did not score all of his victories in his A-6... and the transition period between A-5s and A-6s were very short. In the middle of 1943 Fw190A-5s were still being equipped, and then in a few months, the Fw190A-6s were already arriving.
So, it is VERY HIGHLY possible, that Hackl probably used the same paint scheme for his Fw190A-5s and A-6s. Fly a few months in the Fw190A-5, the A-6s arrive, paint it the same way and fly the A-6.. you get the pic.
The only thing we'd need, is find a profile pic of Hackl's A-5.
Except, I tried it last time, and failed. (Although my source was severely limited)