Its about market, They produce certain products for certain countries. Maybe the USA gets a little better one because they see a stronger market. Maybe they have a lesser one for Canada because the projector competition isnt as bad there and they can lower there build cost by making one with different internals. It's all about money and marketing. the HD200X is not the HD20 no matter what anyone says.
The xbox360/PS3 is global, you dont see an xbox360X or PS3X anywhere. Companies dont make new models for each country. Now they have different rules, like whether its Pal, NTSC, or NTSC-J. A company can make 1 product and sell it everywhere if they wanted to. Optoma must have had a good reason to produce a lesser model for Canada and anyone else who got it.
Optoma probably used an older DLP chip or something else electronic, that caused it to be not as good. As for the case and everything, we'll that's mass produced so it wouldn't be cost effective to make a new design, but they did make the hd200x black to distinguish between the two for a reason.
It's also possible that the HD200x has something inside of it that doesnt meet USA standards which requires Optoma to use a better part for there USA customers. They wouldn't ship that all over because it cuts into there profit margin.