Do the Tilde textbooks and Software Publications textbooks have the same assessments in them?
Software Publications and Tilde Publishing are not affiliated in any way. They both produce very similar text books to support modules taught at TAFE. Teachers usually pick one or the other for their students to use. But they are not the same and therefore it is quite possible that although the content is very similar the assignments are different. Check with your teacher.
To find a copy of your text book to borrow you could look at the TAFE Library Catalogue
OR contact your local Campus Library directly for help
Your local Campus Bookshop may also have copies for purchase.