There are differences in the tax credits, so effectively in the price of giving across the provinces. You could use both charity information returns, because you know the location of the charity, for tax-receipted giving, as well as individual tax returns, because you know the residence of the individuals, to explore the differences across the province.
Also, I believe in Alberta a few years ago they instituted a change where they increased a credit for donations to charities within Alberta. I believe that is correct.