@Turner_727: Thank you! It works now!
@Turf: Do you have your techboxes.pcx file correct? And some of those techs aren't in Civ3, perhaps this is Civ2, or a mod?
@mabellino: If you haven't already gotten an answer, you back up the stuff that is in the watercolor graphics pack, then replace the other ones. Now that I think about it, though, it might work if you edit Civ3X to search a scenario folder with the graphics in it. You could try that, I guess, but I don't think it will work because the GOTMs/COTMs are .sav files so it wouldn't apply to your civ3X IIRC.