These are rebadged Korad power supplies.
Try looking for Korad PSUs, they are much cheaper but identical but the printed name on the front.
If you are in parallel mode, one control will set the voltage of both PSUs, so both will be identical automatically. Without beeing in parallel mode, you will have to set the voltage of each separately.
I am not sure right now about the serial mode - i will need to try out first.