Hi SallyS,
Talalay and molded Dunlop are both made in molds with pincores and the liquid latex flows around the pincores when it’s poured into the mold so there are no “pieces” left that used to be part of a solid layer.
The only time you would have holes “punched out” from a solid layer after the latex is cured would be with some types of continuous pour processes where the layers are made very thin (usually up to 3") which don’t need the pincores to carry heat (usually steam) to the inside of the latex core to cure it. There are some videos that show the Talalay and the molded Dunlop process in post #3 here.
Phoenix