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I know with the Chinese-sourced plastic in the Collectible Minifigures (for instance), the ABS plastic is translucent:
As for the name on the studs, I'm not sure about when that happened, or if it's happened multiple times. We've seen examples of both in our own collection, although I've never checked the translucency or wall thickness in DUPLO.
@richselby, I'll see if I can get a good snapshot of the underside if appears to make a difference.