North Carolina does not provide special admission rules for government attorneys licensed in other jurisdictions.
The North Carolina Multijurisdictional Practice Rules (MJP) do not explicitly include or exclude government attorneys from the unauthorized practice of law. MJP Rule 5.5, Comment 1 states that attorneys authorized by federal statute or other federal law to represent the interests of the United States or other persons in any jurisdiction are excluded from the unauthorized practice of law.
Please also see the North Carolina Bar Reciprocity page to view the qualifications for Admission on Motion, and the North Carolina Pro Hac Vice page to view the requirements for admission to a particular proceeding.