Charcoal nd Polished metal both are the same colors, the darker one was Greynite only offered in Civic, nd i guess is still offered in Civic only.
Toyota ofers gun mettalic,
Suzuki also has another name for the similar color
but the Honda one is not that Metallic, its like Charcoal or u can say polished metal.
@waleed khushi bougt a new civic, try searching for his posts ul find the charcoal/ polished metal color there its the same.