A "Canadian" model is likely to specify that it is for the 10/22 RIFLE so the RCMP can't claim it's advertised for pistols also, therefore end up prohibited like another factory 25rpimd magazine. ....
The other mags already being sold may eventually be deemed prohibited if the manufacturer advertises them as pistol mags. The difference between the Canadian and currents available models may be nothing more than the word RIFLE being printed on them.