No, the funding is the same.
As we and Mr. Foucher have stated, education is publicly funded in Ontario. The four systems are therefore funded by the provincial government. Federal funding is provided through agreements between the two levels of government. Under the Canada-Ontario agreement, for example, certain funds are directed to the province to support certain programs. Access to public schools and Catholic schools is therefore the same. The amounts are not the same, of course, but each system has the same access to funding.
You have to remember that 70% of students attend Catholic schools and 30% attend public schools. You have to bear that ratio in mind when figuring things out.