Yes, it does change from province to province. What is common is that they all require that you bring back the forest “free to grow”, so it has to be regenerated when you harvest the area. Typically, there are requirements. You can do that either through natural regeneration or artificially by replanting. Normally, the requirement about what you're allowed to plant will be that you're only allowed to plant seedlings that have grown from seeds from the region.
There are now trials in B.C. to do what they call “assisted migration”, where they will be purposely planting trees from a different region, although it's on a trial basis. They created that exception to the rule to allow for these tests to take place, either in changing the species from height or from latitude. Normally, in most regimes, and from what I know, when you plant, you're required to regenerate using the same species from the same region, considering that you might plant only one species but it might become a mixed stand because some other less-desired species will still come and regenerate themselves naturally, such as aspen, for example.