Now is the season for Aeonium propagation!
That is not Zwartkop, which is purple and has flatter rosettes. I would not know what to call it, though. I don't know if it colors up in the sun.
You will get better results from your Aeonium propagations if you trim those long stems back to half an inch or roughly where the stem changes color from green to brown. There is no advantage in keeping a long stem (the bare, leafless kind anyway) when propagating Aeoniums.
No particular propagation pics here at the moment, so how about this offset I separated a month ago (with some roots), now established and growing in its new pot, and the mother plant, after having given up 9 offsets. And the grandmother, out in the public garden, busy with her own new family.
Here is a photo from a month ago showing what that offset looked like before being potted up.
I would consider those fairly good roots for a pretty careless agave separation (no disturbance to the rootball of the mother plant). Timing is everything.
