You could try installing the Multi-SH3 utility. This allows you to use multiple installs of SH3 so you could have a GWX, a NYGM and a WAC version on your hard drive and will allow you to mod and play these at will. It's probably the easiest way to compare these three supermods.
Multi SH3 is at:
http://www.subsim.com/radioroom/showthread.php?t=141242 under 'Utilities'.