So ilets say I make a worldmap for a client, all the shapes of coastlines etc ... copyrights to use it are paid etc, what if the client decides wants to make a future new map based on that work , that follows same coastlines and geography traced but with a different style and janother artist may be , is that considerate a derivative work ? should be considered copyright linked to the original still?

and the second point, selling maps made on like Tolkien , westeros , or other notable franchises worlds is a copyright proibited?