ecureilx,
That video is the one. There are a few others. Our aircraft was definitely ASW. It had all sorts of ASW stuff in the back and no rescue hoist. Also, It appears from the video that the crew/passenger door on the left side is bigger on the SAR than on our ASW aircraft.
As you can tell from the video, the nose gets a good washing at just about any forward speed in the water. If the crew in the crash video didn't have the front sealed she is going to take on water. Just stating the obvious.