It really looks like Graptoveria Debbie to me, which is a hybrid between Echeveria and Graptopetalum.
Graptoveria (XGraptoveria 'Debbi')
With sun stress they end up more purple like some of the photos in the database but they can go quite green if they don't get enough sunlight. If you Google it, you'll find quite a few that look even closer to what yours do. I may be incorrect, but the leaf shape, coloring and shoots strongly mean me in this direction.
