Context: The canon law of the Eastern Catholic Churches, which had developed some different disciplines and practices, underwent its own process of codification, resulting in the Code of Canons of the Eastern Churches promulgated in 1990 by Pope John Paul II.

Question: In what ways did the Eastern Catholic Churches's legal systems vary from those of the west?
Answer: different disciplines and practices

Question: What led to the Code of Canons of the Eastern Churches?
Answer: process of codification

Question: When was the law of the Eastern Catholic Churches promoted?
Answer: 1990

Question: Who sponsored the promulgation of Eastern Catholic Church laws?
Answer: Pope John Paul II

Question: What was the name of the formal version of laws ruling the Eastern Catholic Churches?
Answer: the Code of Canons of the Eastern Churches

Question: What did the Easter and Western Catholic church have in common?
Answer: Unanswerable

Question: When was the coded canons of the Western churches promulgated?
Answer: Unanswerable

Question: Who promulgated the code of canons for the Western churches?
Answer: Unanswerable

Question: What was the informal version of laws the Eastern Catholic churches?
Answer: Unanswerable