I have two bikes set up for a tow cart with the pictured hook up. It shows a square insert:
We want to buy a kid cart that uses the same fitting. Can anyone identify a manufacturer that has a same fitting?
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I think I've found it
It looks like a Croozer but you might want to check the dimensions.
The cost of a new hitch is far less than the difference in price between different trailers. Fitting is trivial, you do it every time you take the wheel off to fix a puncture, so even swapping between hitches isn't too onerous.
It's far better to get the trailer you want given your budget, and get a spare hitch to fit that if necessary - one should come with the trailer. I paid £/€/$10-20 for my spare.
The only exception would be if you really need 2 trailers both to fit 2 bikes, and already have one. If you've already got one, it should have a brand on it, though admittedly brands come and go. Even if the brand has ceased to exist, searching for spares for that brand might tell you what else they fit.
A round hitch is far more common (Hamax style) IME, or the Burley style, but that's more expensive