How do I separate the control of the DT22 sockets from the two sets into separate remote controls?

I bought 2 sets of 3 electric sockets each controlled by a remote control type DT22 from Castorama. The problem is that the remote control operates 2 sockets from each set in each of the three positions, i.e. by pressing the ON button in the position of socket No. 1, sockets No. 1 from both sets are switched on at the same time, and so on. What can be done? I thought each set was controlled by the remote on a separate frequency, and it turns out that probably not. Please help with this.
jktiger

And aren't there any "triggers" somewhere under the flap for setting the code or channel? If not, there is not much you can do, because it is not about the frequency, which is common for practically all such devices, remote controls, thermometers and buckets of other stuff: 433.920MHz.

unfortunately, there are no switches either on the sockets or on the remote control.

You can play around with tuning the transmitter and receiver, but I don't know if that makes sense, especially blindly and by feel.
I have had a similar circus with a wireless thermometer operating on 433.9MHz. I found an unbelievable bargain for 24.99,- in a builder's shop of a certain large chain and wanted to be crafty. I bought two. Unfortunately, the manufacturer was more clever, because while in the other weather stations I have a choice of three channels, here there is a fixed one and everything is "jammed".

If you have some skill, you can play around. Otherwise, don't bother, because nothing good will come of it.

Thank you for the explanation, although it did not comfort me. Well, hard luck. At least I got rid of my illusions. Merry Christmas.