Using Artwork in TTRPG Books

So this is a question I had even after reading all of the FAQ because I found it to be a special case.

So if I use purchased art (under extended license) in one adventure product, then I cannot use it in another or in a supplement that is a separate release? Even if it’s the exact same thing?

For example, I buy a character art pack from an artist on Envato, I make a monster with one of the artworks and then use the EXACT same monster in another book. does that count as a separate product?

Would I have to get the license twice in order to use the artwork in a second separate release even if the product created out of it (the monster with the associated story, statblock, etc.) is exactly the same?

In continuation to the above question, what if I make a big book and then release smaller parts of the book separately?