Both current Cosmograph Daytona references run the same Calibre 4131 (automatic, ~72h power reserve, Superlative Chronometer) and share the same architecture: fixed monobloc bezel, no date, no Cyclops lens. What changes is the case material — and everything that comes with it.
Oystersteel case, black dial, black Cerachrom bezel with tachymeter scale. It's the entry execution of the current Daytona family, with the same mechanical performance as the platinum version.
950 platinum case, ice-blue dial, and a brown "chocolate" Cerachrom bezel that Rolex reserves exclusively for this execution — no other current Daytona reference carries it. The case material and that exclusive bezel are the two elements that justify the positioning difference.
Mechanically they're the same watch: same Calibre 4131, same power reserve, same certification. The decision is about material and aesthetics — platinum adds weight, a different dial color, and a bezel that exists on no other Daytona reference.