If you are lucky enough to be on the line where the declination is 0°, both are already equivalent, or if you orient your map with your compass (see page 00) then you have made the two equivalent.

To take a bearing by map: Holding the compass flat, point the direction of the travel arrow toward the landmark you have chosen. Rotate the compass dial until the orientating arrow is lined up ...

put your compass on top of the map and rotate the grid lines so they align with your compass needle, which will be magnetic north. A bearing is the direction of an object or destination ...