Is this an official Suntory two-bottle set?
No. Suntory sold both bottlings through duty-free channels but published no two-bottle pack containing them, and no set price or set code exists. The pairing and the single SKU are Midnight Whiskey's assembly of two separately released bottles, and the page states that rather than implying producer packaging.
Weren't these two released together?
The Hakushu Japanese Forest Bittersweet Edition was released in late 2023 alongside the Yamazaki Smoky Batch The First. The Smoky Batch in this set is The Fourth, a later release in the same series — so the launch pairing belongs to a different bottle and is not claimed for this set. The two bottles here share a distillery family, a channel and a specification, not a launch.
What do the two bottles have in common?
Both come from Suntory's two malt distilleries — Yamazaki and Hakushu — both are duty-free bottlings rather than domestic releases, both carry no age statement, and both are bottled at 43% in 700 mL. Each is also a single-idea whisky: one built entirely from smoky malt, the other matured entirely in Spanish oak.