In principle, you can use any controller that gives the same power. You don't have to use one like you already have.
From the code, yours is from Santrol , which are OEM only. It's 24v and 13 amps. If you get an alternative one, you might need to swap over a connector or two and you need to buy a matching LCD for it. Prices are from £30 to £80 depending what you want.
If you're not sure about this, show a picture of all the wires and connectors attached to your controller.
What is the problem you're trying to solve? Maybe you don't need a new controller.