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The shift between AMG and MGA is approximately 200m in a northeasterly direction. The images below give an example of the shift relative to the UTM Northing and Easting grid lines.
AMG
MGA
To convert between grid points, users add 100 m to the Eastings, and 200 m to the Northings. As a practical example, for a 6-digit grid reference, add 1 to the Eastings (the first three digits), and 2 to the Northings (the second three digits). So the junction of the two roads Hampton-AMG436645 becomes Hampton-MGA437647. The examples below have more information on reading grid references.
Since all objects on a map remain the same relative to each other between the two systems, bearings do not change.