Change in use

No nonconforming use shall be made of any land, building or structure which shall be substantially different in character from the nonconforming use made of such land, building or structure at the time of passage of this amendment or any subsequent amendment. A nonconforming use shall be considered substantially different in character if it is not specifically mentioned as a line item under the "use classifications" of article VIII of this ordinance with the existing nonconforming use. The zoning board of review may grant, as a special use permit under the provisions of article V, permission for a change of a nonconforming use to another nonconforming use of a more restrictive character. Such a change shall be subject to any safeguards or restrictions deemed appropriate by the board.