After playing around with this you have 2 choices:
If you haven't done too much work in the project and only get a few "Missing" library parts when loading only the 9.0 library I would replace the missing parts with 9.0 parts and chalk the whole thing up to experience. BTW, just worry about the missing objects, not textures.
Unfortunately, the parts in the TG library have a "tg" appended to their name so you will have missing parts. If there are too many of them, follow Mike's advice and sort out the missing parts, creating a library that contains only those parts and their appropriate macros.
Probably, the first alternative will take less time overall unless you are really far along in the project.
When you start your next project, make sure that only the 9.0 library is loaded.
Woody