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Japanese vs western hex shank

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Old Oak
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Can someone explain the difference between a Japanese hex shank and a western hex shank? I have various Star-M drill bits and the cut out is not at the same distance from the end on all the bits. I’m assuming that means some are western and some are Japanese? But which is which?

6mm f-type and 3mm 601:

IMG_2546.jpeg

#StarM #StarM601
 
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Japanese have a longer start to the hex (the biut between the blunt end and the waist). So the one on the left. I have a Japanese market cordless impact driver (Makita TD173D) which has a Japanese style chuck. In order to prevent western-style bits and bit holders rattling around I have to install a small slug in the chuck before the bit or holder. Not ideal. The alternative for me is to get a Vessel bit holder, but I haven't done so just yet
 
Thanks. I was partly confused because the one on the left came in packaging with English text while the one on the right came in Japanese retail packaging with Japanese text.

I have a couple of Wera rapidaptor bit holders and they can handle both styles with no play.
 
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