Need downgrade patch for Doom2 1.9

Hi All

I have recently come across a DOOM TC from the DoomWadStation based on the
Nintendo characters. I have cleaned up the WAD (the markers - and the lists
themselves for that matter - were all over the place). However, the "exe
patch" is not a DEH file but appears to be a DEH'ed copy of Doom 2 v1.7a (or
at least that is what DeHackEd thinks it is). File size is 686,997.

If I had the right doom 2 version, I could just rename this file to
doomhack.exe, run dehacked and save a patch. However, my Doom 2 is V1.9.

Does anybody have or know of a way to downgrade a copy of Doom2 v1.9 to
v1.7a? Of if anybody has both versions, would anybody be willing to create a
patch for me that would do that?

I could just rip out obvious text changes, but I don't know how many other
changes the person did (e.g., monster properties). This file is dated
January 1998 so it is quite old.

Regards

Martin
-- 
Martin HoweBombay/Asian Self Breed Club: Webmaster/Kitten Reg.:
www.bombaybreedclub.org
London Cat Club: Webmaster: www.londoncatclub.org
"I mean, you just KNOW Kane's gonna look inside that egg, yeah? ... What an
IDIOT!!"  [Ridley Scott in "Shock & Awe"]