The 1st is not National Guard, but Militia (i.e. conscripts)
The coatee and cap are British. The crossbelts are locally made, but according to British patterns. Of the thousands of british bayonet belts that were send, many did have only buckles. Others had a variety of plates.
The British caps had been send with pompons (white with a red base) and were so issued.
Its unlikely that the fanker distinctions were looted from French stores. In 1815 a new uniform with specific flanker distinctions had been prescribed. Anything perchased or requistioned would have been according to this new pattern. In 1814 no flanker-ditinctions had been allowed. According to a report from the Inspector of the Infantry many bataillons purchased them anyway. Apart from turnback devices these consisted of red and green epaulettes, wings or even silver lace on collar and cuffs. We now of at least one militia bataillon that had red and green pompons for right and left flanker companies respectively. A british pompon with the top dyed green fits perfectly into this situation. So do the red and green epaulettes.
The 2nd figure is the nearest Dutch equivalent to a National Guard.