2D
In the interest of accuracy I did not suggest the Kegworth plane was on approach, I merely used it as an example that even professional pilots can mis identify which engine is faulty, then I continued to suggest a procedure to try to ensure correct identification before precipitous action is taken, particularly when shutdown is more than likely not called for.
Having said all that, I am more than grateful I was not in one of the Kegworth pilots seats.
However I have experienced engine power loss on approach in a twin, fortunately without any drama.