It should work, but you will need to flas the bios on a320 board first in order for it to recognize the 2600 cpu. Ideally I would suggest b350 or higher for ryzen 2xxx, as the power delivery is stronger. You will be limiting the cpu performance somewhat due to the weaker vrm on a320.
If you don’t want the additional trouble with bios flash and such, get a 1600, it’s a bit cheaper and works with the a320 without bios update.