All of the ministers have been paid the same salary since day one. What is going to change is the funding mechanism, if you will. For ministers who are appointed under the Salaries Act, those funds flow from the consolidated revenue fund.
For ministers of state, funds flow under appropriations. If the changes to the Salaries Act were to become law, the salaries of all of the ministers and cabinet would flow from the consolidated revenue fund. It's just a question of which stream the funding comes through, but all of the ministers have been paid the same amount since day one.