Veneer Plaster known as Skim Coating involves installing a drywall type board, taping the seams, with paper tape using Dura bond for strength then base coating to get the surface nice and smooth. Most importantly, straight and square in angles
Plaster crown could be installed over many different sub straights including drywall blue board which is a plasterboard that is like drywall, but plaster adheres to its surface without any bonding steps or existing plaster walls.
Remodeling with existing plaster is not as difficult as one thinks. There are many different options this also could apply to dry wall also considering when removing tile or wall paper from drywall levees the finish on drywall pretty messed