In the Parliamentary Librarian case, it's an order. A competition was held, and candidates were interviewed. A recommendation was made, and the Prime Minister's order in council was introduced in the House. The House then adopted a motion that was submitted to the governor in council for approval. That is the process for the position of Parliamentary Librarian.
The process for the Parliamentary Budget Officer is different. Under that process, the Parliamentary Librarian must strike a committee to propose three candidates to the government leader in the House. He then submits those names to the governor in council. And it stops there because the House doesn't vote on it.