"Plasterboard, drywall, gypsum, etc. are all names
for the same thing. "
I thought as well until a thread on this ng back in Mar 2005 that I
researched the product (button board) & while I was at iit I found out
the difference between plasterboard & regular drywall (or USG's
"Plaster is possible over regular drywall but it is not the exact right
Plaster Board is designed as the substrate for interior plaster finish.
It is available in 3/8", 1/2", and 5/8" Fire Code
it absorbs water faster than regular drywall
so despite the fact we all (me too) refer to all drywall products w/
seemingly interchangeable names pasterboard is (was?) a somewhat
different animal, though probably close to extinction. I have not seen
it in a long time & a web search seems to find only in AU & NZ.
I plasterboard comes with blue paper as opposed to white for regular or
green for the "water baord" flavor
$1400 is nuts, I'd remove the damage area back to some logical break,
use regular drywall & texture to match; someone is blowing smoke