I know Death & Co likes to list specific brands (which I in fact find helpful) but I think it might also vary depending on the cocktail. Something boozy (OK, a lot of stuff in the book is pretty boozy!) and agricole forward probably could be impacted by the brand of agricole. But others may not be so dependent on the brand depending on what else is used.
@FrogPrincesse as always provides excellent advice and has already covered what I would suggest. Try what you have access to and then move on from there when (not if) you come under the spell of all things agricole!
You might well find that to your own palate a different brand is preferable to what is recommended in a particular cocktail book, even one as good as Death & Co.