There are different varieties of the species Hoya carnosa but not are all named and it is not really necessary to know the variety name. Simply referring to your plant as Hoya carnosa is just as correct as when a variety name is attached.
Some of the more commonly seen varieties of Hoya carnosa are Rubra, variegata ( Krimson Queen and Krimson Princess in the U.S), Holliana, and Chelsea. There are some less common varieties that are really cool. Hoya carnosa Freckles, Grey Ghost, etc.
I would just refer to your other plant as a pink flowered form of Hoya carnosa. If you want to see some other forms of the species check out pages such as Apodagis, Epiphytica, GrowingHoyas.com, MyHoyas.com, Hoyor.net.

Mike

Are folks thinking the right hand plant is also a Carnosa? I ask 'cause it looks more like a pubicalyx to me, both in leaf shape & bloom color.

PG, I can take pics of them side by side, if that would help. I appreciate any ID help.

xo
kittee

No need thanks, let's give it a day or 2 for others to see.

But in this I agree w/ Mike, the naming really doesn't matter, it's more about the care & they have mostly similar care as far as I know.

I could not remember the IML number but now that I am home I would like to mention Hoya sp Ban Ngong Ngoy IML 1514. This species is from Thailand but it very closely resembles both Hoya carnosa and Hoya pubicalyx or another close relative. The question that still needs to be answered is if this is Hoya carnosa, Hoya pubicalyx, another, or an independent species?
Of course to go along with my first response there are also Hoya dasyantha, Hoya motoskei, and Hoya fungii as close relatives of Hoya carnosa and these are all seen in cultivation quite often.

Mike

I recently received Ban Ngong Ngoy from a seller and it does very closely resemble carnosa. I just love it. I love anything carnosa and hoyas that grow fast.

Susan

Thanks for the help!