Just watch this video of a looping gone bad during a flight display. At 1:40 into the video it becomes painfully obvious by how much both can diverge in extreme situations.

The flight path angle is the difference between pitch attitude and angle of attack. If pitch attitude and angle of attack would be equal, the airplane could only fly straight ahead at the same altitude. Once it climbs, it has to increase pitch attitude at constant angle of attack. With enough thrust or speed, both can be 90° apart.

Now consider flying inverted: Both are almost 180° apart.

In a dive, again the difference will become large because the flight path angle takes on negative values.

The more fun it makes to fly an aircraft, the more both angles diverge. Only boring aircraft will keep both of them at similar, low values.

Just before the ground impact

Just watch this video of a looping gone bad during a flight display. At 1:30 into the video it becomes painfully obvious by how much both can diverge in extreme situations (shown above).

The flight path angle is the difference between pitch attitude and angle of attack. If pitch attitude and angle of attack would be equal, the airplane could only fly straight ahead at the same altitude. Once it climbs, it has to increase pitch attitude at constant angle of attack. With enough thrust or speed, both can be 90° apart.

Now consider flying inverted: Both are almost 180° apart.

In a dive, again the difference will become large because the flight path angle takes on negative values.

The more fun it makes to fly an aircraft, the more both angles diverge. Only boring aircraft will keep both of them at similar, low values.