The NTEE Category (U.S.) or Charity Category (Canada) submitted should be the same as the one that is assigned to your organization by the IRS (U.S.) or Canada Revenue Agency (Canada).
U.S.-based organizations can often find their NTEE category shown on your Guidestar profile: http://www.guidestar.org
Canadian organizations can find your Charity Category shown on your CRA List of Charities and Qualified Donees profile:
https://apps.cra-arc.gc.ca/ebci/hacc/srch/pub/dsplyAdvncdSrch