My Gerrish Grey tree set for FS 2000/FS 2002 work fine in FS 2004....in fact all I did was to drag them over from my FS 2002 Texture folder and drop them into my FS 2004 Texture folder...

...(after removing the originals into a spare folder...just in case...)...

...!
...set the date to Autumn, (Fall), and see the golden leaves...!!
Cheers all...!
Paul....

...!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.