22.—(1) Where a scheme makes provision in relation to earners in one category of employment which differs from provision made in the case of earners in another such category, the Department must be satisfied that the scheme satisfies section 8A of the Act in relation to each of the categories of employment which is to be contracted out.
(2) Where a scheme makes provision in relation to one description of earners within a category of employment which differs from provision made in the case of another description of earners within that category, the Department must be satisfied that the scheme satisfies section 8A of the Act in relation to each such description of earners which is to be contracted out.