Ok so I've got a noodle scratcher and want some input before I open my mouth to my higher-ups. I recieved a new boundary description from a surveyor that uses metes and bounds in the form of bearings N XX°XX'XX" W going XX feet and so on. The coordinate system they used was a custom Traverse Mercator projection. However, my state, North Dakota, uses State Plane S Nad83 Int. Feet (a Lambart Conformal Conic projection) as its standard coordinate system; so I believe that all their records would be stored in that system.
My question is what, if any, difference will there be in the bearings if it were transformed into the State Plane system? Both systems use the same units, datum, and spheroid.
I understand their reasoning for using the custom coordinate system as they shifted the false easting and northing to reduce distortion in the location they preformed the survey and using a perfect square coordinate system without converging lines of longitude make sense at this scale. However, because all the records I see for the state never specify a coordinate system I think it is implied that the state's standard coordinate system is used. I don't want this data on file without the custom coordinate system attached and have someone in the future go out and use the description using the wrong coordinate system. Or is the discrepancy between the two, if any, so miniscule that I'm being needlessly nit-picky?