Work experience - job titles


Am applying for EE and am trying to arrange experience letters in the format required. Please guide me for the following

  1. The job title that best suits me is Marketing Manager but my first job was a desk job nothing related to marketing: can I show that work experience.
  2. The next two jobs are into marketing but have different job titles like relationship manager and business developer. Is it ok if the job title is different on experience letters and the duties match?
    3)Should I change all job title in my experience letter to the NOC i.e Marketing Manager.

Thank you

More important is job duties matching the NOC description . Your experience letter should list the title, number if hours , and salary if possible .