The common uses are different and the meanings are different.
1. Different common uses: the character Chao is relatively rare and is mostly used in ancient documents or special occasions, while the character Tuo is more common and is often used in Buddhist culture and calligraphy art.
2. The meanings of the words are different: the word "Chao" means slope, field, etc., while the word "Tuo" means turning or rotating, as well as a way of practice and artistic conception in Buddhism.