Planet Ocean question

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new to Omega. love Planet Ocean. Need help understanding differences between 232.30.46.51.01.003 and 215.30.46.51.01.001. Quite a price difference but look identical. Can u help?
 
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The former is the older version with the 9300 movement. The latter is the newer Master Chronometer (METAS certified anti-magnetic) with the ceramic dial and LiquidMetal numbers on the bezel.