I wish that I had more information about this plant for you, but after scouring the internet, I can come up with nothing as to where this plant comes from. I am wondering why it has not become a species yet. It is funny some Hoyas become a new species literally months after being discovered and some take years. This one has been in the trade now for at least 10 years, but still has not been named other than by accession number.
This is a great Hoya if you can find it, and while somewhat easier than sigillatis, it still is very susceptible to over watering. I wish that I had my plant back, and if I ever find another, I will pick it up.