The acorns are pretty much the same color they were when new.
And the color really isn't that close to Ravello. I'd say Tricker's beechwood is sort of close to Ravello. For that matter, Ravello varies quite a bit in color from batch to batch.
If shoe healer has your size in the coffee Eatons, I'd get those.
I take the same size in 4444 (Eaton) and 4497 (Stow). YMMV.
Otherwise you can get acorn Stows anywhere unless you're talking about Acorn Stows with the light edge trim in which case you're pretty limited to Shoe Healer or some other random special makeup of them and I'd probably still go with the Eatons.