This feels like bait lol.
Long story short: super different, not redundant in the slightest, and 2 of my favorite makers. I've had a Shindo 220 gyuto, nakiri, a tall nakiri, and a bunka. Also have Okubo 180 big nakiri and 250 gyuto.
Kyohei Shindo knives are thick spined, particularly at the pinch, with very aggressive distal taper, particularly on the gyuto or bunka. They're all extremely thin behind the edge, and he does a hammered S-grind that helps with food release. Nice steel, pleasant to sharpen and retains its tooth for quite a while, but even when dull it's a geometry cutter due to how thin BTE. Choil photos show below. They're not super heavy knives, with a bead blasted kasumi and dark KU with lacquer. Even without lacquer, they're not particularly reactive.
Okubo is on the other side of the spectrum from a grind perspective. Thicc convex that does not look good from a choil shot but cuts very well. Superb food release, minimal distal taper, no lacquer on a thick scaley KU. They're heavy, forward balanced, particularly because the handle is super light. My Okubo 180x63 nakiri is 234 g. Excellent steel, no lacquer, delightful to sharpen, stiff. Just a true workhorse that will keep you happy. There's a little more curve to a standard Okubo nakiri than a standard Shindo, but the Shindo tall nakiri is the most curvy so...idk. They all are nice, they cut very differently, get both, be joyous. Feel free to ask any specifics.
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