Alright, good to know regarding the fuming! Maybe I'll try that next go around with QSWO when I'm not trying to match anything I've already got.
As for this, then, I know the stain I've got will match because it is an Ohio Certified Stain, which is one of the standards that the Amish use. My thinking is that whether it is oil or water base, it'll age the same as the other furniture so they should stay matching so long as they're colocated.
I could call up the Amish shop to see what they used as the top coat, but I was posting here to get recommendations for imitating that look while compensating for finishing not being my strong suit presently... I've got Flexner's book on finishing, which is very informative, but with there being so many different kinds of top coats I'm not sure which to select for comparison testing.