Rapeseed and Canola are two different crops. Rapeseed has a different mix of fatty acids and is not approved for human consumption, but it is used as a coating in the production of certain plastics. Canola is an edible crop.
I don't know what you mean for different crops. If for Rapeseed we mean Brassica napus it is allowed for human consumption provided it does not exceed a certain percentage of erucic acid, which according to Wikipedia in the EU is 5%. Canola is just a Canadian commercial denomination of oil obtained from certain varieties of rapeseed. Rapeseed oil produced outside of Canada I presume cannot be sold as Canola, which doesn't mean Canada is the only country to produce edible rapeseed oil.