I don't think it is possible since nursing is a regulated field in Canada, which means you need to have a license or be licensed before you can work. NNAS is the first step to attain this licensure. The "non-comparable" result, as others have already explained, is basically the equivalency of your nursing education or training to that of Canada's. If your NNAS result does show this, the Regulatory Body may ask you to do a refresher course or bridging program before you are eligible to write the Licensure exam. Passing the licensure exam is the last step for you to be licensed. And then you can start applying for nursing jobs in Canada.