I’m certainly not an authority on this. The foliage resembles another HK that I have ,it also blooms “Yellow”! The flowers are more green when opening.
These two are from the same cross that produced your lovely plant. They are more green at opening, but fade to the more golden tones you find in Roth. One clone was more yellow.
(I lost both of these in the freeze, but I thankfully now have another sibling of the same cross here in Madeira.)