How much taller is the one pouch from the other? It's hard to tell from the angle in the video. I'm curious if the taller one is for the 32rd magazines which are 20cm tall compared to the 25rd magazines which are 17cm tall. Both measured from the top of the feed lips of the magazine ro the bottom of the base plate.
As far as i know, the Dutch Army, KL, used 32 round magazines but the Airforce, KLu, only used the 25 round magazines. There was no mixing of these. Similar to the KL, Army using the collapsible metal shoulder stock and the Marines and Airforce having wooden stocked weapons. These were not mixed either. I would agree with Simon that the very small difference in size is down to the initial manufacturing process. Nice thought though.