I guess you could say that overall, Watching the Clock
draws more on elements of TNG than elements of DS9. Still, it's a DTI book, not a TNG book.
And chronologically speaking, DTI:WTC takes place well before IFM. WTC covers March 2381 through February 2382 (approximately the same span as Rough Beasts of Empire
), while IFM is January to March '83.