Hi Sas,
I think that you mixed it up.
Dauphine is "Grise de Tarascon" and is known to have been grown near Versailles in what was some of the first documented winter protection techniques for fig trees.
Dauphine is supposed to be cold hardy since there is one grown of 8 meters/24' in height here in my Zone7... Well there is at least a second smaller one :) .
"Violette Dauphine" is less known here, because it was not chosen to be grown by some institution, or public garden .
I have both (hopefully not mislabeled - both nursery acquired ) growing since September 2014. No fruits to speak of, for now. Hopefully this season, I'll get to taste both... or may be next season ... Patience ... Patience ...
As for the trade, if the cuttings are from a reliable source, just go ahead. Swap them around. Unless you have a plan for big bucks sometime later on ...