Long story short, the bigger one is a "S. x Judith Hindle" and the smaller one is a S. Leucophylla.
Both were left out on the porch all winter long, in Zone 5/6 weather (Twin Falls ID, 83301), with very limited watering. The lowest temperature I personally saw was 8F. No winterization was performed or even considered, the plants were on a shelf on a somewhat sheltered porch.
The pot was a standard plastic pot, the soil was a layer of dead LFS, a layer of peat/perlite, and a top layer (about 2 inches) of LFS.
Are these a lost cause, or would some tender loving care bring them back to life?