Well, indeed, most aeroplanes turn exactly like the Spitfire: when wings are not level, you pull the stick and move the elevators. Result = a turn. I really can't see how this is not accurate. SM-79 has ailerons on wings so it can roll, and also has elevators in the back.
Also, if you pull e.g. 3 Gs with SM-79 and 3 with Spit, yes, your turn rate at the same speed is pretty much the same. Can SM-79 handle even that much after 4.10 for longer periods, is another question.