Seamless Senoise (or about almost anything?) without reflect

Alright so I’ll put it quickly and simply, I am making a vfx asset which I need to use this vfx asset in a rather specific way so I need to make it fully seamless.
What do I mean by seamless? Imagine 2 of the same asset and you put one at the left and one at the right, connect their edge and it will seem as if the asset is contunuing from right to left

Why do I not want reflect? It makes it look weirdish with repeating patterns which I do not want, yes I want a way to make a seamless nonrepetitive pattern asset. What do I mean by this? As an example, remember the image I talked about as an example? I want it so that the left isnt the same as the right but they would still connect if put together, same goes for up and down.

How can I achieve this? I really couldnt find anything about this so it would be absolutely great if someone could give me a hand here, thanks.