The zero crossings are the same in each, of course, but the highs or lows showing strength are on the respective different bases.
[2] Momentum signals (e.g., 52-week high) have been shown to be used by financial analysts in their buy and sell recommendations.
[3] Momentum is the change in an N-day simple moving average (SMA) between yesterday and today, with a scale factor N+1, i.e.
How high (or low) momentum gets represents how steeply the SMA is rising (or falling).
The TRIX indicator is similarly based on changes in a moving average (a triple exponential in that case).