When I was learning Zigzag trading system and posted everything here I recognized the differencies. The people who developed zigzag trading system during the 5 years evaluated many zigzag indicators to use it together with channel indicator and with fractal indicators. And they found that zigzag is changed all the time but High_Low v2 is changed sometimes only. And zigzag and High_low v2 are the two different indicators.

I do not like when some indicators are the changing all the time. Because channel indicator is changing sometimes (on the chart). But simetimes only. And this High_low v2 is changing but sometimes. It's ok.
But zigzag is changing more often. And they are different.