Since we're talking about it:
Shimano itself says that as long as you match the hose to the lever, their 'same level' brake calipers can be swapped between road and mtn.
IOW if you have a new set of hydro shifters and a post-mount bike, you can swap in some XT/XTR calipers with your Ult/D/A and it'll work. OR if you have an older set of post-mount brakes and a new flat-mount bike, you can swap the other way.
Note: I haven't personally tried this 'cause I'm on cantis, but the next bike's likely to be disc. May be post mount if I go closeout. May be flat mount if I go 'this year's'
If you run a TRP hybrid system and some compressionless housing, you can sidestep the whole thing. ...but that's another topic
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