One of the wheels might be an updated version, a spare, or sourced from a different casting facility. I'm not quite sure which BMW's were all offered with style 44's, but if there were multiple models offered with the same wheel, they might have a different place that sources the same style wheels. The other reason could be casting improvements or a lack of material in a region that was producing wheels and they switched suppliers. Either way, I find it hard to believe there would be a "replica" of a style 44 as its not a highly desirable wheel.
I could also be very wrong as well, who knows.