It depends. I would have to look specifically into it. This is an evolving area. For example, the one in B.C. just became operational last month.
There are processes in place to build these bodies where it makes sense. For example, in Nova Scotia, I know there have been discussions with New Brunswick, P.E.I., and Newfoundland to use the existing and new Nova Scotia body, primarily for reasons of cost-effectiveness. You have the body. It's a civilian-led body. It can conduct these investigations, rather than, say, New Brunswick. Instead of recreating that, given the size of their jurisdiction and the small number of these incidents, why not use the Nova Scotia body?
Those arrangements are evolving and are at different stages, depending on the jurisdiction.
In the case of Saskatchewan, yes, it's entirely possible that the Government of Saskatchewan—it's their call—could ask the Alberta body, the B.C. body, or the one that's emerging in Manitoba to conduct those investigations.