The Standard Catalog of Load IDs is just a mod that adds in universal LoadIDs that modders can go and use vs making unique IDs of their own. This means that theoretically if everyone uses the ones in here or has the same IDs as it, mods that add industries should be cross compatible with each other.
As said previously on the home page, Industries Extended NEEDS this to work.
V3.4 of mod: Just a version number change as I didn't do that previously. Sorry for the confusion as I didn't realize so many people had already downloaded the versions that didn't work right for. Usually with Trainz I could get away with it as the site traffic wasn't that much and generally, it might have been hours before a mass amount of people downloaded anything from it.
V6.0: All loads now have a buy and sell price.
Google Doc: