Thanks for letting me know. I didn't know if one was slightly slimmer then the other, can't try them on where I live. And just going off my memory of when I tried the 705sp a year back.
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Momotaro itself doesn't make many "skinny" cuts. But do look into the Blue Owl x Momotaro collabs, because they do produce much slimmer cuts.
I have always liked the APC NS fit, but think the quality of the denim could be better. Momotaro jeans are great quality and even if Japan Blue seems to be a diffusion line, they might be much better than APC. Looking at the measurements at the blue Owl website, the Japan Blue tapered fit seems to be close to the New Standard fit.
It's without a doubt better quality than APC and it's not a diffusion line. If you want something similar to NS and better quality, you can't go wrong w/ JB. But in the world of denim and pants, they're pretty boring in general, but so is NS. I have a pair of JB tapered and like the quality but just don't wear it.