Q: Hello Fr. Paul, this may be a thorny issue, but I think it is important to at least offer an opinion…
Given that the Book of Blessings has been published (1987), it seems no longer licit to use older rituals of the same blessings from the 1964 Rituale Romanum or the 1954 Collectio Rituum for example, the home blessing for Epiphany.
Paragraph 39 of the Book of Blessings says:
In virtue of the Constitution on the Liturgy, each conference of bishops has the right to prepare a particular ritual, corresponding to the present title of the Roman Ritual, adapted to the needs of the respective region. Once the decisions of the conference have been reviewed by the Apostolic See, the ritual prepared by the conference >>> is to be used in the region concerned.<<< In this matter the conference of bishops has the following responsibilities:
a. to decide on adaptations, in keeping with the principles established in the present book, and preserving the proper structure of the rites;
b. to weigh carefully and prudently what elements from the traditions and culture of individual peoples may be appropriately admitted into divine worship, then to propose further adaptations that the conference considers to be necessary or helpful;
c. to retain or to adapt blessings belonging to particular rituals or those of the former Roman Ritual that are still in use, as long as such blessings are compatible with the tenor of the Constitution on the Liturgy, with the principles set out in this General Introduction, and with contemporary needs;
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A: That is also my understanding. The Book of Blessings replaces the previous books. The Conference of Bishops may make exceptions—and ours includes several blessings that are not in the typical edition but are particular to the US.
Here’s a previous post about a related book: https://paulturner.org/blessing-of-chalk/.