Bike manufacturers don't tend to offer up colour codes or specific matches to their finishes. They may give them a name to satisfy the customer's reading a catalogue. Marin with the zolatone grey finishes made it harder again as this was a fairly unique process that the everyday person is unable to attain.
If I were hoping to recreate that look I would hunt out a dark grey colour match for the main frame & apply it with a matt laquer & find a solid dull silver/non-metallic colour for the lugged type sections.
