Identification: is this a giant Schlumbergera? or something else?

Pictured next to my christmas cactus. It seems so similar but not the same size. additionally the source of the nest leaf is not always the same place. any thoughts?

I am in the process of trying to graft them but I wanted to know if it was even worth trying.

Thanks

 

Epiphyllum.

 

Notice that the taller plant is not broken up into crab-like segments.

 

ah thanks. Looks like it will make some great flowers. I bought it a some roadside sale with no details. Looks like my graft will be very unlikely to take.

 

Still worth trying a graft, as cacti have very wide cross-compatibility. But also (even easier), just take some cuttings - cut a piece off, let it dry for a few days to form a callus (protects the cutting from decay) and plant in a well-drained soil mix.

 

Here is a photo of my amateur grafting work. They seem like such similar plants so I can hope.

I will post again in this tread if it actually works. Otherwise I will also update my blog post of it.
My Schlumbergera to Epiphyllum graft attempt