The Boer republics bought the guns from Franceand Germany
just before the conflict.
The picture on the right is of a Creusot 75mm QF. Compare the size of the round held by the man on the left and the cases on the ground right. The weight of the shell about 12lb. Sights on the right of the barrel. Interrupted screw thread on the breech block.
2 pounder would be about 37mm, much smaller. Due to lack of ammunition [all had to be obtained from the Britishforces against their will] the Boer forces wouldn't have used captured British artillery much.