That's a good question. It depends on which areas specifically you are looking at. For example, if it's assistance to help the unemployed, it could relieve pressure on EI, but usually provincial spending is more in the area of training, with contributions from the federal government. It could also be in terms of education, so post-secondary education, which helps people become more easily employable in areas that are in high demand.
These are a few examples where provincial spending can alleviate pressure on federal spending.