Thank you for your question. There is no difference, from the older version to the newer version of Riedel’s O Viognier/Chardonnay (stemless).
The glasses named “Viognier/Chardonnay” are intended for Unoaked Chardonnay or Viognier, which are lighter bodied, fruitier wines. We also have an “Oaked Chardonnay” glass, that is quite a bit larger and intended for its namesake wine, which is a full-bodied white with richer hints of buttery spicy vanilla on the palate.
Regards, Riedel Customer Service
Date published: 2017-12-12