Although there were some important changes (ex. Koryo, family registration) made from the old Taiho Ritsuryo to the new Yoro Ritsuryo, overall there was no significant difference between them, other than the vocabulary, expressions of the words, and some amendments of inadequate laws and ordinances.
旧大宝律令と新養老律令では、一部（戸令など）に重要な改正もあったものの、全般的に大きな差異はなく、語句や表現、法令不備の修正が主な相違点であった。