It's almost certainly possible, but when I've had cans of paint prepared (which, admittedly, was twice ever), they've always told me to get slightly more than I think I need because mixing a second batch that attempts to be the same isn't guaranteed to look the same when it dries. Still, if there's a continuous feedback mechanism like in this article, perhaps that's no longer true.

(Or perhaps it wasn't true even when the shop told me, and they were just repeating some second-hand knowledge that was last true a generation earlier; I wouldn't know).