Yeah, I'm surprised they changed orchestras. My copy arrived today.
Sarge
According to the Haydn 2032 website, right from the beginning it was always the plan to use Armonico for the works needing a smaller orchestra and Basel for the later works with big band. #19 is an outlier in that scheme, being the actual #8 from ca 58-60 (in other words, it's a Morzin symphony, pre-Esterházy). I think Antonini (quite rightly) really likes to mix them up. But if they are only playing it with a smaller portion, should be OK. Haydn played it with ~12 plus himself...
I am also delighted to see another #80 (and 81), while it was a thrill to finally have A version, it is always nicer to have 2 or 3.

