Tale of two Omega Constellation C-Case 168.017

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Posting 2 Omega Constellatino c-case in sunburst silver dial, both in 168.017

The other appear to be yellowish sunburst, or patina'd? while the other is silver with less sunburst
I am not sure if they are meant to be different, but as you notice, the other with the yellowish dirty white dial has slimmer indices, slimmer minute and hour hands, also the text appears to be a tad smaller, and the font a tad different.
also the crown appears to be a smaller type for the yellowish silver dial

Left image has a 24xxxx serial, which indidates 1966, and the other has 31xxxxx which is from 1969

both has a 564 movement, as I am aware that the earier versions use a 561 movements

Did omega change these details through a short span of time?