Nope. Cereus and echinopsis dont interbreed....
Look it up.
Echinopsis is in the trichocereae tribe, cereus is in the cereae tribe. No hybrids exist..
Grafting does not make hybrids...
Echinopsis does a lot of hybrids with relatives(or plants that are now under echinopsis), among the lines of echinopsis x trichocereus, x lobivia, x cleistocactus, x matucana, x oreocereus etc...
