Jinbei is the largest, most successful and fastest growing lighting manufacturer in China, operating from a state of the art factory in Shanghai. I know, because Ive been there and have been round their factory, which is more like a lab than a factory.
They assemble many of the Lencarta products, and the Lencarta products use the casings developed by Jinbei, for purely commercial reasons its much cheaper to use an existing box than to pay for the tooling cost of making another box that wont do the job any better.
For the same commercial reasons, other common parts are also used, because theres no point, for example, in paying for basic components such as a PCB or the control panel its fixed to be made specially when they will do exactly the same job as the ones used in the Jinbei products.
Where Lencarta products are different from the similar looking Jinbei products is therefore not the appearance but the technical components such as capacitors, flash tubes and the like. Thats what gives them the improved performance, so the people who think that Jinbei and Lencarta products are the same, or that Lencarta is just a rebadge of Jinbei, are ignoring the facts.
Lencarta has simply made a commercial decision to save money by using these common parts. This keeps prices down but has the disadvantage that there are always going to be some people who cant or wont see the difference between Jinbei and Lencarta and so they assume that theyre the same, even though the differences are obvious.
Other (very) well known names in studio lighting have their products assembled at the Jinbei plant too. But, being bigger and richer, they use their own cases so nobody knows that Jinbei assembles them, so nobody spreads stories about them being rebadged Jinbei products
Of course, although a lot of re-badging does go on (various flash heads, computers, washing machines, fridges etc), saving money by simply using the same body shell but with different vital components applies to a lot of other products too. I used to have an Alfa Romeo that used exactly the same body as a Renault but it was still an Alfa because it had an Alfa engine, suspension and brakes. I believe that Renault and Citroen also use the same body shells, but each make has its own unique features and different performance.