NOC code is independent of Job designations. NOC code depends on the matching up of a candidate's job duties with the job duties of a particular NOC code. There should be atleast 60 to 70% match between your duties and those mentioned in a particular NOC. Once you identify this code, then it becomes your intended NOC code for Canada immigration.
E-mail to NC-NOC-CNP-GD@hrsdc-rhdcc.gc.ca with your duties and responsibilities, they will help you find the closest fit.