Hum... You are right, the cable seems different:
https://av.watch.impress.co.jp/docs/news/1077519.html
The MDR-1ABP looks like a rip off to me then, although the pricing makes sense considering the Japanese MDR-1A costs a whopping 27,220 JPY (which is a lot compared to the €150 I would be paying in France, €99 when I got mine on black friday on Amazon)
The pricing for the XBA-N3BP makes more sense to me, considering the XBA-N3 is sold 300€ here and 35,290 JPY in Japan while the XBA-N3BP is sold 33,850 JPY for some reason, which is cheaper than the regular N3. The BP variants also do not seem to be sold in Europe but I could be wrong about that.