I would say that's entirely possible. Pfizer-BioNTech is a global manufacturer. They have companies and sub-companies around the world. As to where that would be made and whether a company could leverage that to produce vaccines that are aimed for the Canadian market, I would have to refer to Public Services and Procurement Canada for the details of that and to Health Canada if it changes anything with regard to the regulatory approval.
On January 29th, 2021. See this statement in context.