Here is a photo of H. heuschkeliana Pink showing the buds from a  few days ago.  If you look closely, you can see the yellow form behind it.  I grow both types in the same pot.  I am very fond of this little Hoya, when grown in conditions to its liking, H. heuschkeliana can be a spectacular plant that will look like candy gumdrops hanging from green branches and make your entire room smell like caramel!