Matrix orientationA = Matrix.CreateFromYawPitchRoll(0.34f, 1.21f, 0.543f);//random Values

    Matrix orientationB = Matrix.CreateFromYawPitchRoll(0.768f, 3f, 1.52f);//random Values

    Matrix invA = Matrix.Invert(orientationA);

    Matrix someUnknownMatrix = orientationB * invA;

    Matrix compareToB = someUnknownMatrix * orientationA;

    Debug.WriteLine("----------orientationB-------------------compareToB--------------");
    Debug.WriteLine(orientationB.Right.ToString() + "-----" + compareToB.Right.ToString());
    Debug.WriteLine(orientationB.Up.ToString() + "-----" + compareToB.Up.ToString());
    Debug.WriteLine(orientationB.Backward.ToString() + "-----" + compareToB.Backward.ToString());