Drones aren’t very evasive. Most just fly a set pattern. So yes, you could easily down one with another drone, if you are able to notice it, catch up to it, hit it, and successfully down it. But to effectively do that, you need significantly more anti-drones than drones.

More effective is probably lasers or masers from a ground station. It’s a lot easier to hit a drone when your weapon moves at the speed of light. But that still means you need to notice and target it. And with a ground station, you can only counter stuff in the local area.