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I'm afraid the only way to change the colour of a concrete roofing tile is to paint it. There are actually companies that use a special type of spray paint on tiles to renew them/freshen up your roof so maybe if you tiled in your extension and then had the whole lot sprayed it would all match in the same. Hope this helped

You may be able to source these tiles 'second hand' if its a new extension your wanting them for ? Try Burton Roofing they stock a wide variety of second hand concrete tiles. Take a tile with you though as i believe there is 2/3 different types of this one tile. Hope this helps T Davies & Son Roofing