Yeah they’re all part of the Brassica family. Canola is a bred cultivar of Rapeseed with low levels of erucic acid suited for human consumption and very widely grown so while not completely synonymous with Rapeseed using the term Canola is usually correct especially with respect to the cooking oil.

South Africa has three capitals but they have different roles: Pretoria is the executive/administrative capital, and this branch of the government is run by the head of state. The other roles are the legislative (Cape Town) and judicial (Bloemfontein) capitals. I would assume depending on which branch of the government is delivering news they would use the appropriate capital, but it’s most likely to be Pretoria.

Feel free to correct me I am not an expert or South African.

Sources: Wiki Executive power