With Husqvarnas a narrow kerf bar has a "NK" stamped in the part number area.
Typical narrow kerf saws are home owner occasional use types in the 30-40cc range
A 346XP would not have a NK chain setup from the factory. But one can be installed on a 346XP.
A 440 or 435 home owner saw would be likely to have a narrow kerf bar and chain