As far as I am aware the Genuine Hybrid kits are manufactured and designed(patented) by HDI (hybrid development International).
They have their own manufacturing processes, testing and QA, and also warranty support.
The piping kits, Hose joiners and Hose clamps are also of very high quality compared to cheaper generic kits.
I also deal with a company from China who make generic coolers and kits and they claim to have their own manufacturing processes.
The quality is also good but the difference between the two kits is very obvious.