Do you know Von Nuldt Onkruydt?

Mynhardus Jacobus von Nuldt Onkruydt took transfer of erven 87 and 88 in September 1825 in Paulet Street. He is connected to the founding of the Dutch Reformed Church, and was magistrate of Somerset from 1830 - 1834. He first sold one erven in 1833, and the last in 1843. However, three years later a man with the same unusual name becomes the Commandant of the Stellenbosch Burghers in the Frontier War of 1846 and 1847.

My query is: Is the Magistrate and the Commandant the same person?

Update:
We have discovered Mynhardus Jacobus van Nuldt Onkruydt, born in 1797, was the eighth child of Constantyn van Nuldt Onkruydt, who was born in Amsterdam in 1745 and was later President of the Burger Raad in Cape Town. Constantyn died in 1813. The son, Mynhardus Jacobus, who lived in the small town of Somerset, died in Stellenbosch in 1852. I think it highly likely that he was the Commandant of the Stellenbosch burghers. It was a very hierarchical era, and we have discovered his father’s name as a Landdrost who dealt with loan farms and worked at the castle, and this shows he came from an important family.