All chicken breeds can interbreed. There aren't any dominant or rececive breeds, just the colors, for example, if you cross a rhode island red to an easter egger, and the chicks are red, they CANNOT be called rhode island reds, they can be termed "mixed breed" "mutt" or a "cross"
for your example, an Ayam Orpington cross, or Ayam cemani X buff orpington. People crossing two birds together and saying the mutt is the breed is of the parent it resembles most, is actualy a problem. People will buy a bird for a spacific reason in for show or egg laying, and finding out later it's a crossbreed and it isn't able to be entered in shows, or as good of a layer as a pedigree, also mis identified mixes can mess up the gene pool for harder to find breeds. But the mixed breeds can make just as good as pets, and some are good layers, my original chickens were RIR mixes (production red) and I loved them and miss them. In conclusion, they will be a mixed heritage bird not one breed or another, but a mix, like in mix breed dogs, in any given cross, siblings may look diferent, especaly if one or both parents were mixbreeds themselves.
