1. The pronunciation is different. Ji is pronounced as jí. The pronunciation is jí, jiè.
2. There are differences in interpretations. The definition of "registration" is books; registers, personal affiliations to a country or organization, place of birth or ancestral home, and surname. To borrow something underneath, to cushion; same as "borrow", to take advantage of; to comfort; to assume, if; to be implicit; to trample, to insult, etc.
3. There are differences in radicals. The prefix for book is bamboo, and ancient books are made of bamboo, which means registration, book, such as phrases: books, scriptures, secret books, etc. The word "borrow" prefixed with "Cao" refers to something that is placed underneath, as a cushion, such as the phrases: 韬 borrow, 粿 borrow, 无 borrow, etc.
Baidu Encyclopedia-Jiu
Baidu Encyclopedia-Borrowing