I can't address nurses specifically, but I believe there has been some significant progress made in enabling some of these qualifications to move from one province to the other.
I know that in my own field there has been significant progress made. It used to be that a lawyer couldn't go to another province and enter into the courts or engage in any practise of law. Now they can, I understand, with nominal requirements. Obviously there are provincial laws that the outside lawyer may not know, so there may be some schooling required in that regard, but basically it's not what it used to be.
I suspect that in the area of nursing within Canada they are able to move around fairly well. You hear stories of some professional groups that find themselves in great demand in another part of the country; there is almost a migration from one part of the country to another to meet the economic needs. I suspect that on the whole it's not bad, but there may be some areas, however, where it's difficult.
As you know, this program means to deal with the immigrant coming from another jurisdiction, who has credentials from another jurisdiction and is trying to get recognition here for those credentials from the other jurisdiction.