Sedirea japonica is considered a Phal now!
They can be treated the same as a Phal as their needs are rather similar. There are a few minor differences. They should be allowed to dry out more between waterings (or use a chunkier mix) as they are prone to rot if grown too wet.
They are generally considered to be tolerant of a wider range of temperatures than Phals, and can take a lot more cool/cold than a Phal can. I know shome people that keep them outside say that they can go to near freezing at night with no issues. While they'll do fine in the same light as Phals, Sedirea japonica can also tolerate slightly higher light as well.
My experience with it is that while it's very Phal like in culture, it has been less forgiving (for me, in my conditions, with a potted plant) when I don't get the watering/moisture just right.