Nope, Pin1 is always on the left as you face the rear. The only reason people think it's "different" is because they often refer to the posistion of the power connector, arguing that Pin1 is on the same side as the power connector. That's not true, Pin1 is always on left as you face the rear: the power connector however can be on either side.
So it's best off to ignore the position of the power connector and just remember that pin1 is ALWAYS on the left as you face the rear.
I've owned nearly every brand of floppy made, including the more common brands like Sony, Mitsumi, Panasonic, NEC, Alps Electronics, Newcom, Teac, Toshiba, and Samsung, all of which I carry in stock and can verify if you like. But verification shouldn't be necessary as I've assembled over 1000 systems and never seen a 3.5" 1.44MB floppy with any other orientation.
Now you'll probably prove me wrong with a 5.25" floppy...
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