5ghz 450i AP Country locked?

I am looking for stock of spare 450i APs and found a pair of AP’s that are “Canadian version”. I did not know that there was such a thing. Before we buy, I would like to know if they can be defaulted and set to United States?
If not, what is different with the rules as far as channels and power limits vs the FCC/USA? i.e. what frequencies are locked out/missing?