Regarding couplers (I know - off topic),
To my mind (which is probably suspect most of the time) clone infers that the result is identical.
Unfortunately my experiences and observations show that most of these couplers do not operate indentically to a Kadee. They are substandard in almost all respects, with springs regularly disappearing, jaws jamming open or closed, trip pins incorrectly aligned (horizontally not vertically), they frequently uncouple when a train bunches up and then stretches out again, they frequently will not couple when two vehicles are brought together, they do not reliably uncouple over uncoupling magnets, and one of the weirdest the jaw broke on a coupling I saw a photo of........ unheard of with a genuine Kadee.
The Chinese are getting very good at copying their appearance. They look identical but you can tell when it is not a genuine Kadee when the problems above start occurring.The problem now is that it is difficult to tell by appearance whether it is a copy or a real Kadee.
They are definitely not comparable (nor compatible) with a Kadee.
The best term is copy, and they are only a poor one at that.Happy coupling,