Radicals are used in the same way for Hanzi (Chinese/"Mandarin") and Kanji (Japanese). Most of the Japanese characters are the same as the unsimplified Chinese characters. Furigana is used in a fairly different way, though. You occasionally see phonetic writing similar to furigana underneath characters in books that are used to teach children how to read. But it’s not nearly as common as in Japan, and it’s only (from what I’ve seen) used as a study aid for kids, not in the more creative ways the author discusses here.
The big difference as well is that the phonetic writing in Chinese isn’t part of the language itself. It’s like IPA (the dictionary pronunciation symbols) - they’re used to tell you how to write something, not to actually communicate. Kana (which furigana is written in), is actually part of the Japanese language.