I've had Che grafted & growing on OO for years here.
Tried grafting Che onto mulberry a couple of times - just as I do when grafting mulberry cultivars, or Che onto OO - no takes
I'm not likely to expend any effort to repeat it, or to try grafting the ubiquitous OO onto mulberry.
If Che has actually been reclassified as Cudrania, it would be C.tricuspidata, as demanded by the rules of nomenclature... the specific epithet would not change...