Madvapes was out of Dekang RY4 last time I ordered, so I ordered Hangsen RY4. It's close, but as Mottly said it's a little more harsh than Dekang. I find it smoother in a Protank or Smok Tech carto. In the Vivi Nova it's more harsh.
FWIW, I love Dekang Tobacco, but Hangsen Tobacco has a green grass component. I say green grass because it reminds me of the aroma you get while cutting the lawn. Not good for me in a vape. I mix it with Awesome Vapor Desert Tobacco and it's much better.
When Chinese juices are good, they are my favorites for the price. You just have to find the ones that click.