Momotaro and Japan Blue Jeans are sis/brother companies, not the same at all.
Different cuts, styles, fabrics, dye, and quality, yet if you want to say Made In Japan is all similar then maybe.
But no way are these the same, the price point is one thing already, Momotaro has more premium quality and stitching imo.
Typical differences would be the way each pair from each brand looks, but the main difference to me is the longevity of the denim and way denim fades/fits your legs over time.
It's the most important factor, the end result of your denim, if you're paying 200-350 a pair you would want something nice to hold on to.