We just got 1783 in our market and I've been tasting them head to head over the past couple of weeks. They are very similar but 1783 has a much nicer nose. Also a really noticeable spice flavor, nutmeg I think. I can't remember another pour where it was so prominent.
The price gap is a little wider here, about $5 difference on a liter.
Liter pricing seems to be the wild card in other areas as well.