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gubhi
Chainring that comes with the 'criterium' is a Zen Messenger, not a 'proper' Zen. It is solid and not machined on the rear face for weight saving so is cheaper and heavier.
On the crank, only the outer faces of the crank arms have been polished before anodising, whereas the entire crank is polished on the regular SG75. It's been bead blasted or chemically etched to give it that matte texture, which is cheaper/quicker than polishing entirely.