The situation looks similar to Charles III coins:
Proof & specimen are similar design and composition (they looks differently but this is only different finish).
Circulation & BU have different design than Proof/specimen (different legend on reverse outer ring). This should be separate page.
Today, we have 2 separate pages which is OK, however Proof version should be the separate yearline on specimen page, not on circulation one, I think.
Another topic is question if we really should have multiple lines for 2023 BU coins (there are exactly the same but in different sets).