Its fair to say the Canadian and UK Tories have broadly the same core electorate?
No: the British Conservatives have substantial levels of loyal support from the managerial classes that their Canadian counterparts lack. They can appeal to such people, but in Central Canada it is at best contested territory with the Liberals. The Canadian Conservatives partially make up for this through extra support (cutting across all manner of social and economic divisions) in the West due to regional tensions.
With British parties, a riding like Don Valley West in Toronto would be a Tory stronghold with the Lib-Dems as the main opposition.
No British equivalent of the Prairies/Great Plains in North America. Not sure if a regional party on the right would emerge in the 25 or so rural Prairie ridings. Just hard to imagine Don Valley West and Souris-Moose Mountain having similar voting patterns.