My processing effort ruined long exposure and milky water, about 4 stops. Maybe 5 or more stops. 1903 is 100 ISO and 1922 is Lo 1 (50 ISO), both are taken through variable ND filter some mid value, do not remember exactly. Well, 100 ISO requires less time than 50 ISO, so 3 to 4 stops is correct.
Without processing you see more of the time-smoothed water. With the processing you’ve gotten more of the underlying rocky structures beneath the water, which to me is more natural looking.
Whole long exposure (I see that as goal of this exercise) is lost and it is still not natural, exposure of human eye is 1/100 to 1/200 of second. For example 1/15 will also produce smoothing effect but you can not see that with naked eye.
Lonely thread here. Here is my take of the two shots. Exact same processing, saved as JPG and then aligned for easier comparison; excuse the black bars.
1.PhotoFlow → HL mode (blend) → CA correction → AMaZE → linear Rec2020 (no clipping) → linear sRGB 32f 2.gmic → filter pixels → my fun “texture” filter → resize (1800) → JPG → move frames to align