Different size, yes. But I don't think the color is different. If you look at these pictures comparing the GSM to the CDMA version, it's pretty easy to tell they're lit differently.
In the first picture, look at the gold contacts on the side for the dock.
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It's easy to see, when lined up like this, that the contacts on our VZ version on the left are much duller. I'm about 100% sure that they'll be closer to the nice, shiny gold of the GSM version on the right.
In the second picture, look at the color of the camera lens, and the color of the flash.
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There's no reason for these things to vary between versions.
My opinion is that the lighting was different in both of the photos, and both were lit from different angles. This difference in lighting can easily change perceived color.
Hope this helps put the whole different color argument to bed.