This pair of volumes can be cataloged together on a single set record, although a slightly different group of people worked on each one. Where to get the statement of responsibility?

RDA 2.4.2.2 on statements of responsibility associated with the title proper says to give highest preference to the statement found on the same source as the title proper. So where is that taken from, for a set?

RDA 2.1.2.3 on Comprehensive Description for Resources Issued in More Than One Part says “If the resource has sequentially numbered issues or parts, choose a source of information identifying the lowest numbered issue or part available.” Following this instruction, I used the statement of responsibility from (unnumbered, but implied) Part 1:

the Finnish Committee for the Restoration of Viipuri Library ; editors: Eric Adlercreutz, Leif Englund, Maija Kairamo, Tapani Mustonen and Vezio Nava ; translation from Finnish: Gareth Griffiths and Kristina Kölhi.

But what about the differing statement of responsibility on part 2?

the Finnish Committee for the Restoration of Viipuri Library ; editors: Eric Adlercreutz, Maija Kairamo, Tapani Mustonen ; translation from Finnish: Gareth Griffiths and Kristina Kölh.

RDA 2.4.1.10.1 on Recording Changes in Statements of Responsibility for multipart monographs says to make a note if a statement of responsibility is added, deleted, or changed on a subsequent part of a multipart monograph
and the addition, deletion, or change is considered important for identification or access. As the only change is that part two has fewer editors (and no new ones), I did not consider this important for identification, so did not make such a note.