Could it be one is an earlier prototype that reused the 24-105 housing?
It's faint, but you can see 'USM Z' at the end of the label on the white lens
One could be Z, the other could not be. Granted it does not make sense to do that but it is not impossible, the colors could set them apart.
It's faint, but you can see 'USM Z' at the end of the label on the white lens
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