Auto Ore Dictionary Converter
Simply install, boot, and run the /odc add command while holding the item you want other types of that item to convert to and you'll shortly be converting items in no time.
Example: hold a thermal expansion copper ingot and run /odc add. Now, all other types of copper (railcraft,ic2,etc) will be converted whenever you have them.
For more info and to report bugs, see the mcforums post: http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2473000-auto-ore-dictionary-converter